One little tree frog sneaked into my house, but I could hear him bouncing around behind a stack of boxes. I chased him for a while, then was able to put him outside.
The cat was still struggling with "THIS isn't right!!", but he would eventually have figured out that he could "play" with frogs the same way he plays with mice, and I didn't want that happening.
There's something cheerful and friendly about tree frogs! I guess tastes may vary, but they seem more upbeat and outgoing than toads.