How Long Do Tree Frogs Stay Tadpoles?

Vermont scientists are at a pond to document the species of frogs and turtles they find. We baited some traps, these are live traps with a funnel entrance. And we have sardines and soy oil that we've put in an old sock of mine as the bait. The biggest frog, American bullfrog, can stay tadpoles for up to like three or four years.