You can do this activity a couple of ways. You can get a group of friends to all make the same kind of origami frog below, and then have a jumping contest among your friends. You could also make one of each kind of jumping frog yourself, and then "jump" them to see which one goes the farthest. use green construction paper to make your frogs; this makes them appear more realistic.
Beginner http://www.enchantedlearning.com/crafts/origami/frog/
Intermediate http://www.froggyville.com/origami.htm
Expert http://www.origami-instructions.com/origami-frog.html