I still vote for my Bonus Froglet idea:

Bonus Froglet - include different "bonus" froglets on the board. AND you DO NOT know what "bonus" you get until after the turn. Some possible "bonus" examples are:
# 2x frogs - if you jump one of these, your score from that turn is doubled.
# 3x frogs - same as 2x except tripled
# poison frogs - You get no score for that turn

Maybe include 5 "bonus" frogs on each board - 3 of the 2x, 1 of the 3x, and 1 poison frog.