The American Bullfrog is a problem only where it isn't native, mostly the western US. It is native to your area and should not be considered a pest to be controlled there. Sure, it eats things, but that's its job. It's been doing it for millions of years, with no ill effects. It's not good policy to try to control native predators; people have been doing that for a long time, usually with disastrous results. We can't go around deciding which native species we like and which we don't. They're ALL essential.
Tadpole identification is difficult and often requires killing the tadpole. A key to common eastern species is at http://www.trentu.ca/biology/berrill/IdentificationTable.htm
