Judging from what I've seen I don't think they really recognize other frogs as anything more than squishy beanbag chairs or possible food items/mates.

On the other hand, my larger frog was extremely shy until he was introduced into a tank with a smaller frog. After a few months of watching the little frog go outside the tank, he was finally brave enough to step outside himself.

I don't know whether this was due to confidence from being in a heavily planted tank, or maybe just the passage of time. But when I got him he was in quarantine for three or four months and all that time he seemed frightened of me.