Combine lime juice, fresh Thai peppers, 1/4 cup plus 2 tablespoons fish sauce, and dried chile flakes in a bowl and mix well. Add shallots, mint, cilantro, peanuts, onion, red onion, green onions, and ginger. Mix well. Heat a nonstick skillet over medium-high heat. Add pork; cook and stir to break it up until pork is no longer pink in the center but not yet browned, 3 to 5 minutes. Drain and discard grease. Allow pork to cool briefly, about 5 minutes. Transfer pork to a bowl and add dressing mixture; mix very well. Let the salad sit for at least 10 minutes before serving. Spoon mixture into lettuce leaves, like putting a hot dog in a bun.