Because there are no Dairy Queens in France, I assume you are looking for an equivalence, a restaurant that exists in France that is similar to the American Dairy Queen.
I don't know if such a thing exists, but (to help any native French who want to try), Dairy Queen is an American fast food chain that concentrates on ice cream treats and desserts. It also serves burgers, hot dogs and fries, though ice cream is really the main focus. There is often one in every small town in middle America, and it is probably considered a bit lower class as far as restaurants go.
