I’ve frozen milk with great results. It’ll turn a yellow color, but when thawed, it goes back to white. Just make sure to remember the date you froze it, this way you can remember how many days you have before it goes sour.
I’ve never had a change in quality at all. As for cheese, sliced freezes well. Soft cheeses aren’t great for the freezer, or so I’ve heard. I know cheddar freezes ok, but not real sure about the other hard ones.
Maybe someone else will know. Yogurt is awesome in the freezer as a frozen treat…I have no clue about how it is after thawing, though. I use it in popsicle molds. Cottage cheese turns watery on me, so I’ve only tried it once.