Once the cake has cooled, mix in 3/4 of the frosting with the crumbled cake using a hand or stand mixer until just combined.
Check the consistency of the cake mixture. If it's moist enough to roll into balls, refrain from adding more frosting. If needed, incorporate the remaining frosting. Generally, I use all the frosting, but it varies with different cake recipes or boxed mixes. Avoid adding too much frosting to prevent the cake pops from becoming mushy.
Shape tablespoons of the cake mixture into round balls and place them on a lined tray. Freeze for 10 minutes or refrigerate for 30 minutes, then roll the balls again for a smoother finish.
After the second rolling, freeze the cake balls for another 30 minutes or refrigerate for 1 hour and 30 minutes.
Melt the chocolate when the cake balls are almost ready. Melt half the chocolate in a microwave-safe mug, using 20-second intervals and stirring in between until fully melted. Alternatively, melt it over a double boiler, then pour into a cup. Melt more chocolate as needed.
Dip the tip of a cake pop stick into the melted chocolate, then insert it halfway into a cake ball. Repeat with the remaining sticks.
Dip each cake pop into the melted chocolate, swirling to coat completely. Tap gently on the edge of the cup to remove excess chocolate. Twirl to wrap any dripping chocolate around the cake ball and decorate with sprinkles before the chocolate sets.
Stand the cake pops upright to set completely, using a cup filled with rice, a cardboard box with holes, or Styrofoam.
Repeat the process with the remaining cake pops. Monitor the chocolate’s consistency, reheating if it thickens. Ensure the cake balls remain firm; if they soften, refrigerate or freeze as needed.
Let the cake pops set completely before serving.