Do you happen to know when their breeding time is? I remember seeing somewhere that the males will have darker brown pads on their feet during breeding time, and a few days ago Luigi's looked very dark. And he's been croaking so much lately, but that could be because he loves his new bigger home. But I'm curious if it was their breeding time, then if he didn't do anything with the other frog, could that be an indicator that they're both male?