Let's assume Venusaur is a frog, or at least froglike enough. I don't actually care about this argument mind you; As far as I'm concerned Venusaur is Venusaur and it doesn't have to be one or the other. But, for our purposes, let's assume it is a frog.

Is it actually feasible for it to be jumping around like it is in the trailer? It's 100 kg according to the Pokedex, and while obviously you should take that with a grain of salt it does seem too large and heavy to be jumping around that fluidly.