Blue leopard frog?

[UncleChester]

But aside from croaking, males have much larger tympanic membranes (ears). They will be bigger than the eye. On a female it will be the same size or smaller than the eye. That's the easiest way to tell.

Hi Ashley, I've never heard this applied to Leopard frogs before. Do you have any pictures of a male Northern Leopard frog with a large tympanum to show the difference? I've looked through some of mine and the tympanums are all small (several are definite males). I think you have to go by calling (vocal sacs in the armpits may also be visible), nuptial pads on the male during breeding season, and females being larger than males (tough to tell even if you know the frog is mature). If the frog lays eggs it's pretty obvious too.