Deuteronomy 2:20 KJV
(That also was accounted a land of giants: giants dwelt therein in old time; and the Ammonites call them Zamzummims;
Deuteronomy 2:20, King James Version
In context
19 And when thou comest nigh over against the children of Ammon, distress them not, nor meddle with them: for I will not give thee of the land of the children of Ammon any possession; because I have given it unto the children of Lot for a possession.
20 (That also was accounted a land of giants: giants dwelt therein in old time; and the Ammonites call them Zamzummims;
21 A people great, and many, and tall, as the Anakims; but the Lord destroyed them before them; and they succeeded them, and dwelt in their stead: