To list all toppings for pizza is impossible as the list is only restricted to the restrictions imposed by your imagination. Even popular pizza toppings are not easy to categorize when the Americans prefer pepperoni and the Japanese favor squid.
Having said that prefered pizza toppings are individual, I have attempted to compile a list of pizza toppings without using esoteric marshmallow and squid ink! Pizza is so universal that a pizza chef somewhere will have added every type of food known to man on a pizza, for sure an Aborigine will have popped a witchetty grub on a pizza somewhere, the witchetty grub being the larvae of the ghost moth. Equally a Thai pizza chef will have used green ants at some time. Crickets are a delicacy in Burma .
Whilst I regard it as unlikely that a chef has not combined all of these three toppings on a pizza I am not going to put any money on it! Should any one want to try to put green ants on the pizza they are better as a garnish they should never be cooked it destroys the Vitamin C and it as their Vitamin C content that makes them a valuable food source.
Pizza toppings are normally placed upon a pizza in a specific order, not because it is tidy but because the pizza sauce keeps the pizza dough moist, the cheese then provides a bed for the toppings to rest on and they do not dry out or fall off as the pizza slice is held. More cheese is added to keep the dough moist and the garnish is not cooked so it is applied last after baking. The following list is the traditional order:
Alfalfa Sprouts, Artichoke hearts, Avocado, Baby leeks, Beetroot, Black Beans, Broccoli, Capers, Capicolla, Carrot, Cherry tomatoes, Dried tomatoes, Eggplant, Fungi, Fungi carciofi, Green peppers, Kalamata olives, Lettuce, Mushrooms, Onions, Olives, Peas, Porcini mushrooms, Portobello Mushrooms, Red beans, Red onions, Red peppers, Roast cauliflower, Roasted eggplant, Roasted Garlic, Roasted peppers, scallions, Shallots, Snow peas, Spinach, Sun dried tomatoes, Sweet corn, Watercress, Wild mushrooms, Yellow peppers, Yellow squash, Zucchini.
Almonds, Peanuts, Pistachios, Pecans, Pine Nuts, Walnuts.
Basil, Bay Leaf, Cardamon, Chili Dried or Fresh, Chives, Cilantro, Coriander, Cumin, Dill, Garlic, Jalapeno Peppers, Laurel, Marjoram, Methi Leaves (aka Fenugreek), Oregano, Parley, Pepper, Rosemary, BasilBay Leaf, Cardamon
Anchovies, Cajun Prawn, Crayfish, Lobster, Oysters, Prawns, Salmon, Shrimps, Smoked Salmon, Squid, Tuna, Whitebai
Blue Cheese, Brie, Camembert, Chedar, Colby, Feta, Goat Cheese, Gorgonzola, Limburger, Manchego, Monterey Jack, Parmesan, Mozzarella, Muenster, Port de Salut, Provolone, Ricota, Romano, Roquefort, Smoked Gouda
Bacon, BBQ Chicken, Beef, Cajun Chicken, Chicken Masala, Chicken Tikka, Chorizo, Duck, Ham, Honey Cured Ham, Meatballs, Pepperoni, Proscuitto, Salami, Sausage, Serrano Ham, Turkey, Venison