Combine first 11 ingredients in a large nonstick skillet; bring to a boil. Cook, uncovered, 5 minutes or until vegetables are tender.
Place 1/2 cup lettuce in each taco shell. Spoon 1/2 cup corn mixture into each. Top each with 2 tablespoons tomato, 2 tablespoons cheese, 1 tablespoon sour cream, and 1 tablespoon salsa.