Make and bake cake mix as directed on box for 13x9-inch pan, using water, oil and eggs. Cool. Crumble into bowl. Add frosting. Shape into 1-inch balls; place on waxed paper-lined cookie sheet. Freeze until firm; keep refrigerated. In microwavable bowl, microwave green candy melts and 2 tablespoons of the shortening uncovered on Medium (50%) 1 minute, then in 15-second intervals, until melted; stir until smooth. Repeat with black candy melts and remaining shortening. Dip tip of each lollipop stick about 1/2 inch into melted green candy and insert stick into cake ball no more than halfway. Place on cookie sheet. Refrigerate 5 minutes. Remove from refrigerator a few at a time. Dip cake balls into melted green candy; tap off excess. Poke opposite end of stick into foam block.