Brown ground pork in a pan with onion and garlic. Once cooked, add 1/2 cup Buffalo sauce and 1/3 cup green salsa. Simmer until sauces are reduced and mixture is cooked and thickened. Let mixture cool a few minutes. Spoon pork mixture over pizza crust. Drizzle over more Buffalo sauce. Top with cheese. Bake at 375 to 400 degrees on a middle oven rack until bubbly and brown, ensuring that crust is cooked. Top pizza with green onions, a drizzle of buffalo sauce and creamy sour cream.