Most of the deluxes and some of the moderates have a main theme pool, as well as a more standard swimming pool which doesn't have the theming and amenities found at the main pools. The latter wouldbe considered the "quiet" pool.
I love the quiet pool at the Poly, it truly is a quiet sanctuary. At the GF the "quiet pool" is usually as crowded as the theme pool. At the AKL there is only one pool. As you can see, there's no difinitive answer.
Disney's written policy on pools is that they are for the benefit of the guests of that resort only, so no, the official written policy is no pool hopping.
Anne