Quahogs, also known as hard clams, are a type of bivalve mollusk found in the Atlantic Ocean. They are a popular seafood item and are commonly used in chowders and other dishes. Quahogs are larger than the more common soft-shell clams, and their shells are harder and thicker. They can be harvested from the ocean floor by hand or with a rake. The term 'QUAHOG' is derived from the Narragansett Indian word for 'big clam.'