Something is in my house

[Glinda]

I have a mysterious occasional frog, croaking in my front room.

This occasional frog croaking has been going on for several years now. I think the little bugger is living (mostly hibernating?) between a giant plastic plant pot and the attached drip catcher thingie underneath. I've looked everywhere else in that room, and there's just no frogs anywhere, but every now and then he starts making noises.

(Note: The plant was planted in that pot about eight years ago. There were no frogs in it then, and the plant went directly from my former guest bedroom to my current front room - no outside rest stops. The pot is big, and exceedingly heavy - doesn't bother me enough to try to take it apart.)

Just heard him yesterday - first time in probably six months.

Can't imagine what he's eating (haven't found any evidence of bugs in that room, either), but he sings his little froggie songs to me a couple of times a year.

My question is, is this possible? Can a frog stuck between a pot and coaster (for want of a better word) live on nothing for years?