quahog n.

"large, edible, round clam of the Atlantic Coast of the U.S.," much used for soups and chowders, by 1753 in roughly the modern spelling (quogue; Roger Williams had it as poquauhock, 1643), from an Algonquian language, perhaps Narragansett poquauhock or Pequot p'quaghhaug "hard clam."