We can milk sheep and cows, why not reindeer?
Really just me being selfish and wanting more immersion for my northern tribe reindeer herding characters (including a fantasy of someday having a completely nomadic character who migrates and lives off the meat/milk/hides of their herd of reindeer).
From what I've read of the historic evidence of the practice, the milk yield isn't very large and the reindeer require some special handling, such as typing the female reindeer by her antlers with a rope or lasso, but I think it would be great to be able to do it and create traditional Sami-style cheeses!