Dallas-based Red Mango, a frozen yogurt and smoothies chain, added frozen coffee chillers to its lineup. The coffee chillers, said to be all-natural and fat-free, are the first coffee-based beverage for Red Mango. They are available in four flavors — vanilla, caramel, mocha and natural coffee. The chillers are made with medium-roast Colombian Arabica coffee, nonfat frozen yogurt and crushed ice. They also contain live and active probiotic cultures. The frozen coffee is sold in a 16-ounce cup for a suggested retail price of $3.95 to $4.95 and in a 20-ounce cup for $4.95 to $5.95.