Our New "Pet"

The only plant growing in a pot in our house is actually placed outside, because we thought that we were pretty bad at the green thumb thing. So we placed it outside, near the water waste pipe from the upstairs air conditioner.
The past few months, a frog has dug in and made it his (or her?) home, well at least, bed for the daytime naps (since he/she goes off somewhere during the night). We named the frog Zuma, and claimed it as our pet, although we really don't feed it anything. I think you can figure out what one of our favorite computer games are.
Any tips on what to feed a frog?