frostback
n.β Β«Have a feature in todayβs Toronto Star on all the “frostbacks” on the January press tour.… Frostbacks is an expression Iβd never heard of until Star TV columnist Rob Salem spelled it out for me last JulyβCanadians working on U.S. network television. It is an expanding list, especially this winter, with a mix of familiar faces and a couple of promising rookies.Β» ββLie to Me, Damned Lies and Statistics” by Bill Brioux Bill Briouxβs TV Feeds My Family (Canada) Jan. 20, 2009. (source: Double-Tongued Dictionary)
I first heard this term in the early 70’s. It was used in the National Lampoon Magazine occasionaly in the sense of illeagal immigrants from Canada.