Combine the pork, tomatoes, green chiles, yams, onion, garlic, cumin, oregano, salt, black pepper, and hot pepper sauce in a slow cooker. Cover, and cook on Low until the pork is very tender, 6 to 7 hours.
Stir in the frozen corn, recover, and cook until the corn is hot, 10 to 15 minutes. Sprinkle with shredded Cheddar cheese to serve.
