...that said there's evidence that UVB light might help frogs (milky tree frogs at least) develop strong bones. If you wanted to get one of the UVB tropical lights it might help.

American bullfrogs are native to your state, but it still might be unwise to release it in case it picked up anything from the goldfish. Also they tend to eat smaller frogs so a population boom of bullfrogs might not be great for other area amphibians.