You can cook frozen pizza on the grill by turning your grill into a pizza oven. Preheat the grill to 400˚F. Then, turn the burners off on half of the grill and keep the burners on the other side to maintain a temperature of 375˚F-400˚F. Place the frozen pizza on the side of the grill where the burners are off to avoid burnt pizza! Cook for 16-20 minutes, depending on the pizza and your grill.