I have 7 cowlicks, so I can speak with some authority on this particular topic! Should “Double Crown” be used by hairdressers as they refer to the condition mentioned by the original poster? ‘His bald pate was ringed by a crown of thin, nicotine polluted grey hair”

At least within the North East of the United States, the cowlick is the most common and generally understood term, and i hear mine cursed every time I visit a barber.