You can DEFINATELY get Dole Whips at the CS restaurant at the Poly resort called Captain Cooks.
They have a self serve Dole Whip machine and you can get vanilla, pineapple, or swirl.
They don't sell Dole Whip floats, but I'm guessing it wouldn't be hard to create one on your own by buying some juice.
The sandwiches, BTW, at Captain Cooks are great as well!! We go here for dinner for our first night during every trip!