i have cute little frog in my tank also. I call him Demon. Because he had a feast on most of my guppy fry . They really are a lot of fun to watch and they have their special little hideouts.
I have one of those as well ... he's great. He's taking to checking me out when I'm near the tank... he won't even eat until I leave because he just floats around the glass watching my every move and following me if I move to the other side. When I first brought him home he had a thing for ramming the betta at feeding time, but that's stopped. I think he's still full from having devoured all my platy fry Yup ... he got ALL of them, ragardless of all the hiding places I gave them