Yes they do. I am often brought wild/farmed salmon and trout that people have caught to be cured and smoked that have been frozen. Freezing oily fish does not usually impact the texture or the flavour once thawed - providing it has been frozen in air-tight packaging. As it thaws it does lose about 2% of its water.
You may be interested in this thread. http://www.smokingmeatforums.com/t/171886/comparison-of-salmon-curing-methods
You may be interested in this thread. http://www.smokingmeatforums.com/t/171886/comparison-of-salmon-curing-methods