Crumble Cake: Crumble baked chocolate cake into a large mixing bowl. Add chocolate frosting and mix until it reaches a dough-like consistency.
Form Balls: Roll the mixture into 1-inch balls. You should get about 24 cake balls.
Prepare Coating: Melt the black and purple candy melts in a microwave-safe bowl in 30-second intervals, stirring until smooth.
Insert Sticks: Dip the tip of each lollipop stick into the melted candy coating and insert it halfway into each cake ball.
Chill: Place cake pops on a parchment-lined baking sheet and chill in the freezer for 20 minutes.
Dip Cake Pops: Dip each chilled cake pop into the melted candy coating. Let the excess drip off, then stand upright in a foam block or cup to dry.
Decorate: While the coating is still wet, press on candy eyes, mini candy corn, pretzels, and fondant doors.
Detailing: Once dry, use black icing gel or edible markers to draw windows, doors, and spooky accents. Add sprinkles for extra flair.
Set: Let cake pops set completely (about 30 minutes) before serving or storing.