Weren’t there some Giants among the Canaanites?
Deuteronomy 3:11 — For only Og king of Bashan remained of the remnant of giants; behold, his bedstead was a bedstead of iron; is it not in Rabbath of the children of Ammon? nine cubits was the length thereof, and four cubits the breadth of it, after the cubit of a man.
commentaries:
http://trivialdevotion.blogspot.com/2013/07/ogs-king-sized-bed-deuteronomy-311.html
https://en.wikipedia.org/wiki/Og