my gar would eat thawed out frog legs and thawed out bluegill pieces right off the bottom. took about a 8 months to get to that point though. well, before 8 months i just never tried lol. i think it just took him that long to be completely comfortable in the tank. once i moved him to a bigger tank he no longer did this. of course after being in the larger tank for only a month he jumped out.
but anyways, yeah try frog legs from your seafood place. the bluegills i was just catching at the lake near me and freezing them.