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Add 3/4 cup vanilla frosting to small bowl, and tint with green food color; add 1/2 cup frosting to another small bowl, and tint with pink food color. Spoon tinted frostings and remaining white frosting into 3 separate resealable food-storage freezer bags; set aside. Cut 1/2-inch opening from corner of each bag, and squeeze 1/2-inch mounded circles of alternating colored frosting (green, pink and white) around outer edge of cookie; add sprinkles.