Dear WO'N: I have many times seen "williwaw" in stories about Alaska, and suspect it is an Inuit word. T thiink "williwog" is someone's mishearing of "williwaw". Also I have the impression it means of sudden onset, in gusts with rapid changes in direction.

I got a couple hits. One was apparently nickname for some Australian guy, and the other was a pathetic poem about a frog:You have to scroll down a ways:
http://edgarfrog.diaryland.com/011108_59.html

Neither had anything to do with wind.