I think that Deb King, Queen of Frogs, will concur with h2Ofwlkillr...that's the way she learnt me. There was some in-depth discussion on introducing bullfrogs to a pondsite in a fairly recent thread. The drawback, beside the nightly bullfrog philharmonic, was that you may risk the loss of other critters smaller than their mouths. This includes dining on their own.