Preheat oven to 350 degrees F. Line a 12-inch pizza pan with parchment or wax paper. Set aside.Place cooke dough in the bowl of an electric mixer. Pour cocoa over the top. Using dough hook, on medium speed, beat together until the cocoa is completely mixed into the dough. This will take a couple minutes.Place dough on prepared pan and roll out into a 10 inch circle. Bake 8 to 10 minutes. Remove from oven and let cool completely.Place frosting in a microwave-safe bowl. Cook for 15 seconds or until just melted. Add in both food colors and mix to make the color orange. Place frosting in a small ziplock bag. Snip one corner and pipe frosting in a spiral pattern. Starting at center; quickly pull edge of knife outward through frosting at 1-inch intervals to make web design. Let stand 10 minutes for frosting to set. Place plastic spiders on top for decoration!Slice in wedges and serve. (Don't eat the plastic spiders. haha!)