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dutch-processed cocoa means it's been treated with alkali to make it less acidic. to achieve a similar effect, add some baking soda to your regular cocoa powder. you don't mention what amount you need but the basic rule of thumb is
adding 1/8 teaspoon baking soda for every 3 tablespoons cocoa powder you use.
If you were to swap it in baking, go with shaska's advice. But since we talking about icing, subbing natural cocoa (w/o baking soda) is fine.