Whenever someone gets into the pool (in this case, Stef) Frodo feels compelled to jump in after them . . .

What's this? A victim underwater?

Should he try to escape our ministrations. . . .

Then it's right back in after our next victim (whoever these feet belong to).

and guide them back to the pool steps.

First we'll try licking him dry.

We'll catch him and swim right on top of him (this is Glenn).

And whenever Ginger accidentally gets tossed into the pool, Frodo is there to help her out by pulling on her ear.