Needs work, but cool.
Great attempt though, it was fun for a while. Some stuff to make it better/more authentic (I was master of classic frogger).
Make the stuff on the water move faster.
Fix the cars. I got flattened many times because the game registered the car as still there even after it passed.
Reduce the amount of time you get to sink a frog.
Increase the game volume to match the intro volume.
Fix it so you don't die for jumping into the edge of the screen. That shouldn't be death, just a wall. You'd die on the river when that happened because it would keep going while the frog just sat there.
Include the white frogs for bonus points.
Add some crocodiles in the river and snakes on the bank.
Add the badger in the ponds too.
I didn't play for very long, so manybe you have some of these things in here and I just didn't see them. At any rate, nicely done.