Some good cane toad traps have now been invented ...... www.abc.net.au/newinventors
I am going to build one and expect to catch at least 10 each night, average weight about 1 Kilo.

Yes they do contain toxins and disposal is therefore a problem, composting may not be a good idea.
The toxins are most likely not persistent and would probably be destroyed in the conversion process.
I dunno if toads have enough fat on them to make it worth while.
If I set up "The Great Toad Refinery" I could get all my neighbors to drop off their toads and scale up to compete with Texaco etc.
I would become the Cane Toad Oil Sheik, save the planet, and become unspeakably rich.
Sounds good to me.