Preheat oven to 425°.
To prepare pork, combine first 5 ingredients. Rub cumin mixture over pork. Heat oil in a large cast-iron skillet over medium-high heat. Add pork; cook 4 minutes or until browned on all sides. Bake at 425° for 12 minutes or until a thermometer registers 155°. Remove pork from oven; let stand 5 minutes. Cut pork across grain into thin slices.
To prepare salsa, combine corn and next 7 ingredients (through beans).
Combine sour cream and chipotle in a blender; process until smooth.
Wrap tortillas, 3 at a time, in a damp paper towel. Microwave at high 20 seconds. Spoon about 1 ounce pork onto each tortilla. Top each tortilla with about 2 tablespoons salsa and about 2 teaspoons sour cream mixture. Fold in half.