The poison used by South American Natives for their arrows is extracted from stressed frogs, so there is no reason to assume that local frogs won't exude some level of poisenous substance, even if it is less toxic.
The cane toad - an introduced species to Australia - has become a pest there and is responsible for thousands of deaths of endemic animals, especially Dingos.
Cats are notorious for the odd taste idiosyncrasy. One of our neighbour's cats eats paper, but only if it is screwed into a small ball and thrown at it - it will play for hours and than eat it. No harm has cone to it.