Preheat the oven to 400˚ F. Melt the butter with the garlic in a saucepan.
On a work surface, roll out the pizza dough into an 8-by-18-inch rectangle. Brush with one-third of the garlic butter and top with 1 cup mozzarella. Arrange pepperoni slices along one long side of the dough, then continue adding pepperoni to cover half of the dough. Tightly roll up the dough into a log, starting with the pepperoni side, then slice into 16 rounds.
Arrange the rounds, cut-side up, in an oiled 8-inch cast-iron skillet and brush with the remaining garlic butter. Bake until golden, 20 to 25 minutes. Sprinkle with more mozzarella and continue baking until browned, about 10 minutes. Drizzle with hot honey before serving.