Stir the avocados, 1/3 cup sour cream, tomato, 2 tablespoons cilantro, onion, jalapeño and 1/4 teaspoon salt in a small bowl until blended.
Toss the shrimp with cumin, ancho, garlic and ¼ teaspoon salt in a small bowl to coat.
Heat the oil in a large nonstick skillet over medium-high heat until hot. Add the shrimp and cook for 3 to 4 minutes or until the shrimp turn pink, turning and stirring frequently.
Spoon the guacamole onto the tortilla chips and top with the shrimp.