Frog in a box

What do you call a frog in a box?
Charlie or Willie or Sam?
Probably not.
He came in from the lawn one day
Decided to stay
In a garden trunk full of cool stuff.
Cushions for chairs and buckets and tubs,
Hoses and tools and pruners for shrubs.
Lots of hiding places for a frog and his friends,
in quite an enormous space.
He comes and he goes through a crack in the side,
But always returns to the quiet inside.
So what do you call a frog in a box?
Jack would make sense,
but he seems to like George.