Like LdyDrgn said they primarily eat frogs and toads and don't do well. Several people have been able to get them switched to a rodent diet but most of them report a failure of the animal to thrive, probably due to a rodent diet being inappropriate and incomplete nutritionally for them (but that is just my opinion).
IMO Eastern hogs should be enjoyed in the wild ONLY! If you want a hognose, get a western...