The term 'Tusked Sea Mammal' refers to two species of marine mammals, the WALRUS (6 letters) and the NARWHAL (7 letters). Walruses are large, flippered marine mammals with long tusks and whiskers. They are found in the Arctic Ocean and adjacent seas, and feed on mollusks and other sea creatures. Narwhals are also tusked marine mammals, but they are smaller than walruses and have a single long tusk. They inhabit the Arctic Ocean and feed mainly on fish and squid.