Toad-eating Snakes of the United States

[bullsnakejax]

What are some snakes of the United States that pretty much live off of toads in the wild? I'm aware of the Eastern Hognose, but what are the others?

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[John1982]

The only thing that really comes close are garter snakes(Thamnophis) but they eat a variety as well. Nerodia eat their fair share of frogs, wouldn't surprised me if toad was on the menu too.