Where does “كوپوك” come from?

كوپوك (Ottoman Turkish) comes from Proto-Turkic köp- — to swell; foam; to swell, surge.

Ancestry of “كوپوك”, step by step

Step	Language	Word	Meaning
1	Proto-Turkic	köp-	to swell; foam; to swell, surge

كوپوك — Etymology, Origin & Word History | Etymology Explorer