Just found frozen 4 year old lamb chops are they edible?

If the frozen lamb chops have been stored at a consistent temperature of 0°F (-18°C) or below, they should be safe to eat, as freezing preserves food indefinitely in terms of safety. However, the quality may have declined over time, affecting taste and texture. Thaw them in the refrigerator and check for any off smells or discoloration before cooking. If they seem fine, they should be edible.