Very enjoyable game with great sprites!
If you're planning to improve on the game further I'd love there to be some sort of incentive for going fast. Currently, there isn't much stopping a player from stopping at the first bush they see and hiding in there until the frog is gone (got over 3km and 50 mangoes this way myself). Maybe there could be some baby frogs slowly coming from behind that will check the bushes as well :)