I have been trying to find information on spot development or at least pictures of young Southern frogs to see if it is evident early on. So far, not much luck. However, it would make sense for the spot to be there soon after tadpoles morph and I am leaning more and more to Finn indeed being a Northern Leopard frog. I will also be doing more research into the breeding program. I am not sure if they will except a frog that has been raised in captivity, or how I would feel about giving Finn up, but if he or she can help in conserve the species, it would be worth thinking about. Thanks for your help, Terry.