https://marco.org/2009/04/28/brasil-coffee-house-has-a-great-way-to-make-an
Brasil Coffee House has a great way to make an iced cappuccino. Normally, iced cappuccinos don’t really exist because there’s no good way to make iced foam, so people who ask for them at other coffee places usually just get an iced latte.
At Brasil, they blend milk and ice in a commercial drink mixer (like this) until the ice is very finely ground. It creates an iced substitute for cappuccino foam, and it works surprisingly well.