Dunkin Donuts Coffee Coolatta is the ultimate iced coffee. It's not, as some people would have you believe, a coffee milk shake, and it doesn't contain any ice cream. A real Dunkin Donuts Coffee Coolatta contains Dunkin Donuts coffee and frozen Dunkin Donuts coffee, with sugar and milk to taste. While it's not an exact match for a store bought Coffee Coolatta, you can make your own version of a Dunkin Donuts Coffee Coolatta at home if you plan ahead just a little bit.