I have not, but I also don't know of a reason that frost would not collect on canvas just like it does other materials. I'm hoping that someone with empirical observations and a science-based explanation might chime in.
I had an interesting experience a couple of weeks ago in the Catskills. Temp was 14°F and relative humidity was high... overcast with snow and sleet. Lots of frost on the Chameleon cover. I was also under a Superfly tarp, which had a teensy bit of frost right at the ridge line.
In the wee hours the wind really picked up and the humidity dropped (crystal clear sky), temp went up to 19°F. The Chameleon cover was completely free of frost by 5 am.
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