To further clarify, hognoses of various types have different diets. Some mainly eat toads, others mainly lizards and mammals. Again, regardless of diet, all of those hognose species and their varied diets have evolved the same rear fangs and similar venom.
So the idea that the fangs are for popping toads is, while often claimed, not supported by evolution.
There are snakes (rhabdophis) that ingest the toxins in toads and make biological use of them. They do not, however, turn these toxins into venom, but secrete them from their nuchal glands for defense from predators.
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