Preheat the oven to 450 degrees Fahrenheit. Brush a large cookie sheet lightly with olive oil or prepare a pizza stone. Roll or pull the dough into an approximately 14-inch diameter circle. Brush entire crust with olive oil.
Place 1 cup corn, 2 tablespoons olive oil, garlic, coconut milk, 1/8 teaspoon salt, and pepper in the pitcher of a blender or in a food processor fitted with the S-blade. Blend until nearly smooth but with a bit of remaining texture from the corn.
Pour sauce on pizza dough and spread in an even layer, leaving a 1/2-inch border. Layer on the onions, then the tomatoes, and then sprinkle on the remaining corn. Bake until the crust is golden brown and the toppings are bubbly, 8-12 minutes. Remove from oven and top with basil and a couple of pinches of kosher salt, if desired. Slice and serve.