Preheat the oven to 350°F and spray a small casserole dish with cooking spray. Pour the oil into a deep fryer or saucepan to a depth of 3 to 4 inches, and heat the oil to 350°F. Cook half of the Tater tots in the hot oil until golden brown; this should take 2 to 4 minutes. Once the first bath is finished, drain on paper towels and then cook the remaining potatoes. Place in a prepared casserole dish and sprinkle the cheese and bacon over them. Heat in the oven for 5 to 7 minutes, or until the cheese begins to melt. Remove from oven and top with sour green and onions.