Just bringing this up in case anyone is foolish enough to still be playing this game.
When you get to the fair and find the Frog Hop game, there are different ponds, if it's the harder one just quit the game and go back into it till you get the good one with the lily pad in the middle, easier to keep the aim in the same place and a consistent throw.
3 points each time, easy enough to get to 100 way before the time runs out.