In big bowl, mix first 3 ingredients with a fork. Add crumbs until mixed in. Form into 1 inch balls; chill 1 hour. In small pan, melt remaining frosting over low heat. Dip chilled balls in frosting; allow excess to drip off. Put on cooling rack over waxed paper. Let stand at room temperature until dry, about 6 hours. Tip: As frosting thickens, reheat. Use any leftover frosting to dip fruit or nut halves.