Because rodents were pretty much the only available mass-produced feeder for so many years, the hobby has basically brainwashed itself to believe that all snakes eat rodents.
All of our US hognose are predominantly frog/toad-eaters. Now, years of [unintentional] selective breeding has biased our captive population to be more willing to take rodents, but evolutionarily they are not designed to have a diet composed almost exclusively of rodents
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I will forewarn that ReptiLinks are kind of expensive and may not be as economical if you are only dealing with one animal that eats them. That is why international grocery stores are a huge help. At my local one I can get freshly harvested frog legs, chicken hearts, chicken necks, chicken gizzards (kidney, liver, and other internals), quail eggs, all kinds of fresh and frozen fish, frozen snails, frozen crayfish… It is a smorgasbord of non-traditional feed items
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Yep. Just cut them down to a reasonable size. You can do the same with frog legs, cut them into sections according to their anatomy or just trim the flesh off the bone