Start with a square sheet of paper
Fold it in half diagonally to make a triangle
Unfold it
Fold it in half diagonally the other way
Unfold it
Fold the paper in half horizontally
Unfold it
Fold the paper in half vertically
Unfold it
Push the sides inward to form a square base
Fold the top layer’s bottom corners to the center line
Fold the top point down over the two flaps
Fold the lower edges of the top layer to the center line
Fold the bottom point up over the folded edges
Fold the model in half lengthwise
Fold the two back legs outward
Fold the feet downward
Fold the front part upward to form the frog’s head
Fold the front corners slightly to shape the eyes
Press the body flat and adjust the legs
Flip the frog over
Press the back and release to make it spring