Unroll one of the Fruit Roll-Ups™ snacks and, using only the green stripe, cut out 3 small heart shapes using a tiny cookie cutter. (Use a knife if you don't have a cookie cutter small enough.) Place the 3 hearts with points together to form a shamrock shape and press the edges to stick together. Add a small stem made from the leftover Fruit Roll-Ups™. Repeat with remaining Fruit Roll-Ups™ to make 2 more shamrocks.