1. In a bowl, mix turkey, sour cream, 2 cups shredded cheese, and the salt.
2. Heat oil in an 8- to 10-inch frying pan over low heat. Dip the tortillas, one at a time, in the hot oil just until limp, about 5 seconds.
3. Fill tortillas equally with turkey mixture, roll up, and arrange side by side, seam down, in a 9- by 13-inch baking dish. Pour salsa evenly over the top.
4. Bake in a 350° oven until heated through, about 20 minutes. If desired, sprinkle more shredded cheese over hot enchiladas before serving.