Froggy Squatter

Look closely at who is peeking out from the doorway of this little home. When I see a small house in a tree, I expect to see a bird peeking out from the door. I was surprised to see a frog! What is he doing there? Did he find an unoccupied bird house and simply become a squatter? Should I bring him a house warming gift? What would be an appropriate house warming gift for a frog?