Who are the…
Zamzummim

They are an ancient group of giants; a people great, and many, and tall, like the Anakims (Deuteronomy 2:20-21).

They were overcome by the Ammonites, “who called them Zamzummims.” They belonged to the Rephaim people group, and inhabited the country afterward occupied by the Ammonites.

It has been conjectured that they might be Ham-zuzims, i.e., Zuzims dwelling in Ham, a place apparently to the south of Ashteroth (Genesis 14:5), the ancient Rabbath-ammon.