Prepare pizza crust according to package directions.
On lightly floured work surface, roll out dough into large rectangle, about 1/4-inch (5 mm) thick.
Using large ghost cookie cutter, cut out 12 ghosts, rerolling dough as needed. Transfer ghost pizzas to 2 large parchment paper–lined baking sheets, about 2 inches (5 cm) apart.
Top each pizza with sauce and mozzarella. Garnish each pizza with black olive slices to resemble ghost’s eyes and mouth hole.
Bake according to package directions, about 10 to 15 minutes or until crust is golden brown. Let cool for 5 minutes before serving.