It depends on how strict you are on your definition of “macchiato.” Some people would consider the foam on a macchiato a defining trait of the drink, so an Iced macchiato wouldn’t work. Because of health and safety concerns, most cafes won’t serve a cold drink with steamed milk. However, you can order a drink with the same milk to espresso ratio on ice and some places might call that an iced macchiato. When in doubt, ask the barista.