I have successfully bred bullfrogs and a couple other species in captivity. Where I live the eggmasses are so elusive. If I do find eggmasses they are lithobates clamitans or pseudacris regilla. I dont wan't to take from the green frogs because they are the main competitor with the bullfrog for the "dominant" true frog in the area, though they are also introduced. I do quite often come across pools of tadpoles in their first year that have been laid in the well of a fallen tree or small basins in a forest I herp in. The parents are never around in these pools, and the tadpoles definitely don't have the 2 years of water they need to mature. It'd be "out of the frying pan and into the fire" but I could probably use them feeling they are safe enough.