I did not specify that the toad would have to come from the snake's native range, but given a picky individual that is not responding to other scents, you should consider using a native frog.

I just read an article in the Journal of Herpetology where bullfrogs are capable of determining which predatory fishes are native to their range simply by taking chemical cues from the water. This has huge implications for the animal, knowing whether or not the fish it is sharing its water with will recognize it as a distasteful food item or not. It would stand to reason that other animals, especially chemosensory oriented animals, would act differently towards animals not native to their own ranges and which they have constantly been exposed to. Since toxic secretions are the forte for Amphibians, ranivores might want to pay attention to what they sink their fangs into!!
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...the oldest task in human history: to live on a piece of land without spoiling it."
Aldo Leopold (1938)

"Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us."
Calvin and Hobbes

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