I bought four little frogs for my pond from a local aquatic plant business only later to discover that these frogs are "frog non gratis" in the State of Arizona. Of course the State originally imported Bullfrogs several decades ago for hunters to gig and eat but things soon got out of hand and so the State band Bullfrogs and have been trying to irradiate them all ever since.
These eventually left my pond for a neighbors slimy swimming pool that was home to many mosquitos which the frogs just loved. For me they were no longer my problem and good riddance.
To the State of Arizona, Sonoran Leopard Frogs are Okay. Bullfrogs, not so much.