After lots of observation, I'm almost certain the tadpoles are all the same kind, with some color and slight size variations. Did some research on "tadpole morphology," and they ARE looking like Southern Leopard Frogs. These are common in the area the tads came from.

Hope the pics are helpful. They are about 1" to 1 1/2" long. I estimate they are 3-4 weeks old and are devouring the algae & seaweed food I give them (but not each other). Maybe someone can help with a more positive ID?