Really? Where did she grow up? What is the difference?

My Ellie (a lifetime Rhode Islander) says no one in her family would even know the word "frappe" or what it was at all. She says "egg cream" is a New York term, and "cabinet" is much preferred over "milkshake".

These differences all seem foreign to me -- growing up, I only ever heard "milkshake" and wouldn't have recognized the other three terms as food of any kind ;-) ... !