The term COD COUSIN refers to three different types of fish: LING, HAKE, and Pollack. LING is a type of fish found in the North Atlantic and Mediterranean Sea, and is known for its mild flavor and firm texture. HAKE is a type of fish found in the North Atlantic and Pacific Ocean, and is known for its delicate flavor and flaky texture. Pollack is a type of fish found in the North Atlantic and Pacific Ocean, and is known for its mild flavor and firm texture. All three types of fish are related, and are commonly used in fish dishes.