Preheat the oven to 350°F (175°C). Prepare the cake mix according to the box instructions and bake for 30 minutes. Let the cake cool completely.
Crumble the cooled cake into fine crumbs using a food processor or by hand. Remove any browned edges for a uniform texture.
Mix 1/3 cup of vanilla frosting with the cake crumbs until well combined.
Use a small cookie scoop or your hands to shape the cake mixture into balls, about 1.5 inches in diameter. You should end up with around 24 balls.
Melt the white candy melts in a microwave-safe bowl in 30-second intervals at 50% power, stirring between each interval, until smooth.
Dip the tip of each lollipop stick into the melted white candy melts and then insert it into each cake ball, about halfway through. This will act as glue.
Dip each cake ball into the melted white candy melts, using a tall, skinny jar or deep glass for full submersion. Tap off any excess.
Immediately decorate the pops with black writing gel for eyes, candy eyeballs, or other assorted small candies before the candy hardens.
For additional designs, melt the black, orange, and green candy melts separately and use for drizzling or decorating the pops.
Place the decorated pops on a styrofoam block or a piece of parchment paper to dry completely.