For some reason I never read this as a child. I think that if I had I would've enjoyed it a lot more. I found it very difficult to enjoy this simply because it makes no sense in so many ways. Animals seem to co-exist peacefully with each other, regardless of food preferences, which is something that I'm willing to forgive. That's pretty much a requirement for this kind of story. Where I lose the suspension of disbelief is where you suddenly get an interaction with humans - not only is the toad put in jail, but he is of the right size to disguise himself as an adult human. I can only think with horror of a toad that size.
All in all, I have to say that this was disappointing in many ways and I really do wish that I'd read it as a child so that I would have the memory of it to help sustain my suspension of disbelief.