The Ammonites: Country of: Belonged to the Zamzummims
Source: TTT
Deuteronomy 2:20, 21
(That too was regarded as the land of the Rephaim, who used to live there, though the Ammonites called them Zamzummites. / They were a people great and many, as tall as the Anakites. But the LORD destroyed them from before the Ammonites, who drove them out and settled in their place,