Take a square sheet of paper.
Fold it in half. Be sure to make a precise crease.
Fold it in half again.
Open and fold all 4 edges to the opposite side.
Now you have 2 crosses.
Flip over the sheet and fold both sides to the center.
Flip the sheet again.
You should get this result.
Look at this fold. These two parts must meet in the center.
Fold and repeat for the other side.
Now fold each of the four sides over on themselves.
Fold again on each side like so.
Now fold each of the two sides towards the center.
Fold the back to create 2 pockets in which you slide this part.
Fold the frog in half, and fold it back on itself.
And you're done.