Yogurt.
You can use Sour Cream of Mayonnaise as a substitute of yogurt.
yogurt
Sour cream.
Yes, although sour cream has a slightly tangier flavor since it's been made with active cultures (like yogurt).
Plain yogurt works. The Greek style is best since it's more like the consistency of sour cream.
Greek yogurt!
Milk, yogurt and cheese
Sour cream represents a fat component, so you can use butter, margarine, vegetable oil.
plain yogurt with a little vanilla, or sour cream with a little sugar and vanilla.
both
cheese cream or cheese and cream or cream and cheese