Love the aesthetics so far, most of what I was going to say has been said more succinctly by others but there is one issue I 've noticed.
As far as I can tell you're linearly increasing the speed of the logs every time you jump over one, however because you have not put a cap on this (or any cap you do have is too high) once you reach far enough in the game the logs move so quickly that there isn't ever a frame rendered that causes a collision, so they just phase through our good friend Jerry, letting you just sit on the ground infinitely as the logs get faster and faster forever. The solution to this would be capping the speed at a point the collisions still register, and then as Gabe suggested decreasing the spawn time of the logs instead to add difficulty.
Also I agree with Amy, changing the profile picture to your sprite would be a nice touch, I would die for that frog.