Lee:

Thank you, that was very helpful. I think the creature in my pond most
closely resembles the Florida Gopher Frog, or maybe the Southern Toad. If it
comes back, I'll have to pay more attention to the sound it makes.

I assume that only adult females can lay eggs, so this would be too small to
be a bufo anyhow. I'd say this one was roughly 4" long.

Don