1. Stir together sour cream and 1/4 cup liquid from tomatoes in small bowl to make sauce; set aside. Stir together tomatoes with remaining liquid and coleslaw mix in medium bowl to make slaw; set aside.
2. Sprinkle fish with cumin and salt. Heat oil in large nonstick skillet over medium-high heat. Place fish in skillet; cook 3 to 4 minutes on each side or until fish flakes easily with fork (145 degrees F).
3. Separate fish into 12 pieces. Place 1 piece on each tortilla, top with 1/4 cup slaw and 1 tablespoon sauce. Fold tortillas in half; serve immediately.