Bob, from what I recall from an article I read sometime this past year, your only chances of enjoying U.S. frogs legs is from Deep South local harvesters &/or seafood markets. Although in the case of the markets, it's still best to ask first where those legs came from. Like everything else, frozen frogs legs from Asia & India are cheaper to come by than the quality U.S. product, & markets are trying to make a buck. Our seafood markets around here frequently carry frogs legs, but I **** well know they ain't U.S. I don't even bother to ask & don't buy.
I did enjoy watching Anthony Bourdain's "No Reservations" episode on Florida, as he went "frog spearing" at night with a local & enjoyed an excellent "mess of frogs legs" as a result.
However, one fairly new unfortunate caveat that's recently hit the news is that frogs harvested for frogs legs from the Florida Everglades (a major source) have been found to contain elevated levels of mercury, & thus children & pregnant women should avoid them, & other folks should avoid eating large numbers of them. Some studies mentioned that this is the one of the few times this kind of warning has jumped from fish to higher life forms. Sad.
I'm glad I got to enjoy them during their culinary - & local - "heyday". Doubt I'll do so again unless I have an opportunity to visit the "Deep South".