For hair, cut fruit snack into 14 (6-inch) strips and 14 (5-inch) strips. Cut each strip lengthwise to within 1 inch of top of strip. Place one 6-inch and 5-inch strip together, pressing together at uncut ends. Repeat with remaining strips. Randomly press pairs of strips on top of two-thirds of cake, overlapping as needed and allowing strips to hang over side of cake. Spread reserved 1/4 cup frosting over top of hair.