Thanks, JimO. At the petstore, I was told they heard calling on several occassions, but not recently. One appears to have a slimmer body type, while the other one is more round. In terms of size, they are very close, with the rounder one looking to be slightly bigger. They both have the stripe running the lengths of their bodies. I have seen them both in beautiful shades of green, but as of right now, they are brown.

I am hoping one of them is a male. I have several male Fire Belly toads that call day and night; a Pacific Choros frog male who thinks 2-4 AM is the wooing period (especially since now he has a female partner), and an African Giant Bullfrog who grumbles at me on a nightly basis. I think if one of them is a boy, he will have to work hard to be heard over the din!

Thanks for the info; I really appreciate it. Once they are more settled, I will take more pictures and hopefully the mystery will be solved!