Place the pork chops in a nonreactive dish. Add the garlic, onion, scallion, cumin, olive oil, salt and pepper evenly over both sides of the chops, cover, and refrigerate for at least 3 hours or up to overnight.In a bowl, stir together the mango, avocado, onion, lime juice, cilantro, and jalapeño. Cover the salsa and refrigerate until ready to serve.