What company has a hot-fudge milkshake?

It's difficult to say definitively which company has a "hot fudge milkshake" without more information. The term "hot fudge milkshake" could refer to:

* A milkshake with hot fudge topping: Many ice cream shops and restaurants offer milkshakes with hot fudge as a topping. Some popular chains include Dairy Queen, McDonald's, Burger King, and Sonic.

* A milkshake made with hot fudge: Some places might have a milkshake specifically made with hot fudge blended into the ice cream. This is less common, but you might find it at specialty dessert shops or ice cream parlors.

To get a more specific answer, you'll need to provide more context, such as:

* What geographic location are you interested in?

* Are you looking for a specific chain or brand?

* Are you looking for a milkshake made with hot fudge or just a milkshake with hot fudge topping?

Once you provide more details, I can help you find the company you're looking for.