Origami Jumping Frog That Really Jumps
The jump depends on an accordion pleat at the back and on the weight of the paper. This guide explains both, plus the adjustment that makes the frog hop forward and not spin in place.
Tutorial at a glance
Materials
- Firm rectangular paper, 80 to 120 gsm
- A hard surface
Among traditional models, the origami jumping frog has an unbeatable advantage: it does something once it is finished. Press on its back and it hops a few inches, sometimes a good deal more, depending on the paper.
The jump is neither magic nor luck. It comes from an accordion pleat folded into the back end, which works exactly like a spring, and from the stiffness of the paper you choose. Get either one wrong and you have a good-looking frog that does not move.
Paper Matters More Than Technique
This is the one model on this site where the recommendation is to use thicker paper, not thinner. Ordinary 75 gsm printer paper gives one or two hops and then loses its spring; from 120 gsm up, the frog jumps again and again.
Easy-to-find alternatives: index cards, light cardstock, the cover of an old notebook, thin packaging card. Use a rectangle. Half a sheet of US Letter (5.5 x 8.5 in) or half an A4 sheet (about 14.8 x 21 cm) works well.
Step by Step
Work with the rectangle upright, in portrait orientation.
- Crease the first X. Fold the top left corner down until the top edge lies along the right side. Press and unfold. Repeat with the top right corner, bringing the top edge to the left side. Unfold. You now have an X creased into the top of the sheet.
- Crease the horizontal. Fold the top edge down, passing exactly through the center of the X. Press and unfold.
- Collapse the top. Push the two sides inward at the level of the horizontal line and let the top come down onto itself. The upper part of the sheet becomes a two-layer triangle resting on the remainder of the rectangle.
- Make the front legs. Fold the left point of the triangle up toward the top corner; repeat with the right. Both point upward, like two little arms.
- Narrow the body. Fold the left side of the lower rectangle to the center line; repeat with the right. The frog’s body is now narrower than the triangle.
- Fold the bottom up. Bring the bottom edge to the base of the triangle. The body is now shorter, with twice the layers.
- Create the spring. Fold that same section back down, in half, so its edges line up with the bottom edge of the body. Seen from the side, the frog now has a Z-shaped step. This accordion pleat is what stores the force.
- Turn the frog over and adjust the back legs by opening them slightly to the sides.
Tip
The two creases in step 7 need to be sharp, pressed firmly with a fingernail. A loose pleat does not return energy, and the frog just slides forward when it should leap.
How to Make the Frog Jump
Do not push straight down. Rest your fingertip on the back end of the frog, press, and slide your finger off the back, letting the paper escape. The pleat releases and launches the body forward.
A few adjustments change how it behaves:
- Tighter pleat: a higher, shorter jump.
- More open pleat: a lower, longer jump.
- Back legs opened outward: the frog lands on its feet more often.
- Heavier paper: less height, but a steadier path.
When the Frog Will Not Jump
| Problem | Likely cause |
|---|---|
| It only slides | Loose pleat creases, or a finger pushing straight down |
| It jumps once and stops | Paper too light; the spring loses its shape |
| It spins in place | Uneven pleat; one side was folded deeper |
| It always lands on its back | Front legs too long; fold them a little shorter |
A Game That Works
With two or three frogs in different colors, you can set up a race on a tabletop: a starting line, a finish line, and one jump per player each round. Because the result depends on how the pleat is adjusted, the contest turns into an exercise in trial and error, and that is where a child finds out without being told why a firm crease matters.
For more suggestions on folding with children, by age, see origami with kids. Another model that is fun for the same reason is the paper pinwheel, which really spins when assembled with enough slack.
About the Collapse in Step 3
That move where the top comes down onto itself follows the same logic as the waterbomb base, only applied to the top of a rectangle and not to a whole square. If it feels strange now, practicing the base on a square helps you understand what the paper is doing. The step-by-step is in origami bases.
Note that the thick paper recommended here makes this very collapse harder. If the layers resist, press the creases from steps 1 and 2 more firmly before pushing the sides in, or start with slightly lighter paper until you get the hang of the sequence. The relationship between paper weight and number of layers is explained in the guide to the best origami paper.
Where the Jump Comes From
The pleat from step 7 works like a leaf spring. When you press the frog against the table, you compress that paper step and store energy in the fibers; when your finger slips off, the paper snaps back to its original position and pushes the body upward.
That explains the two variables that matter most. Paper weight sets how much energy the paper can store before it deforms for good: light paper crumples when it should flex and recover. And the angle of the pleat sets where that energy points: tighter, it pushes up; more open, it pushes forward.
After a couple dozen jumps or so, any frog loses height. The fibers along the crease line break down and the spring stops returning all the way. Creasing the pleat again brings back some of the height but never all of it, and from there it is quicker to fold another.
Tuning for Competition
If the goal is distance, three adjustments give a clear edge:
- Paper between 150 and 180 gsm. Light cardstock is the upper limit; beyond that, the collapse in step 3 becomes unworkable.
- Pleat at an open angle, close to 45°. It trades height for horizontal reach.
- Narrow body. In step 5, fold the sides a little past the center line. Less area means less air resistance and a straighter path.
To jump high and not far, reverse it: a very tight pleat and a wider body. It is worth making both and comparing them, since the difference is big enough to measure with a ruler.
Frequently asked questions
Why won't my frog jump?
Almost always because of the paper. Ordinary 75 gsm printer paper loses its spring after a few jumps; 120 gsm paper, light cardstock, or even an index card brings the leap back. The second most common reason is a loosely folded pleat: it needs a firm crease on both folds.
How do I make the frog jump farther?
Press on the back end of the frog and slide your finger off the back instead of pushing straight down. The angle of the pleat counts too: the tighter it is, the higher and shorter the jump.
