Prepare cake according to box instructions. Let cool completely.
Crumble cooled cake into a bowl. Mix with 1/2 cup frosting until the mixture is dough-like.
Roll into 1-tablespoon-sized balls. Place on parchment-lined baking tray. Chill in freezer for 30 minutes.
Melt a small amount of pink candy melts. Dip stick tips into the melted candy, then insert into each cake ball. Let set for 5 minutes.
Melt 12 oz pink candy melts in a microwave-safe bowl (30-second intervals, stirring between). Dip each cake pop, gently tapping off excess.
Melt purple candy melts. Using a piping bag or zip-top bag, pipe stripes while the pink coating is still wet. Use a toothpick to refine.
Add mini chocolate chips as eyes before coating hardens. Pipe melted white candy melts for grins. Let dry fully.
Use black edible marker to draw pupils, teeth, and whiskers. Optional: Attach pink fondant triangles or pipe ears with leftover melts.
Stand pops upright until fully hardened. Store in airtight container.