Cut 8 (12- x 10-inch) pieces of aluminum foil; fold each piece in half lengthwise. Open foil slightly, and twist ends to form boats. Place foil boats on a large baking sheet, flattening bottoms. Place corn tortillas inside boats, pressing gently to form shells. Bake at 350° for 15 to 20 minutes or until crisp. Set aside.
Combine corn and next 10 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.