Ribbet me this
Brain ostensibly useful.
But sometimes, brain not good, and brain want activity where not required.
You use this cash to buy new frogs in different breeds and rarities.

I think I might find this obnoxious elsewhere, but the prospect of epic frogs delights me.
Heres a trailer:
The game informs me, after discovering 22 more frogs, Ill unlock frog breeding.
Breeding sounds fun, but Im more excited about having 25 different frogs on screen at once.

Theres also something called prestige that unlocks after I discover 100 frogs total.