I think Irish Potatoes are mostly a Philadelphia tradition served around St. Patrick's Day. Basically it is creamed cheese, sugar and coconut formed into balls to resemble potatoes and then rolled in cinnamon.
Most I've tried aren't all that good. Aunt Angie's homemade version, from the New York Bakery at 11th and Daly in South Philadelphia, are the outstanding exception. She uses real cream cheese and the finished product must be kept refrigerated.
The NY Bakery is also a worthy stop for tomato pies and stromboli.