My three year old wants to know what the frog in yours is doing.
Quite obviously it's hopping down the railroad tracks.
Haven't you ever seen the prototype for Frogger?
It was a little more boring than the final game.
You just hopped down the railroad tracks and avoided the cars at the crossings.
It was a pretty easy game until they added the train.
After that it became pretty much impossible.
You'd get like 10 jumps in, and splat.
That's when they switched to the road/river background that was in the final.