When I was in High School I worked at a Howard Johnson's. What was it? 48 flavors? I can't remember, but there were a lot of em and the ice cream was excellent.
I worked from dishwasher to salad bar, to fryer, to breakfast cook, to set up man, and also 'fountain'.
I was a soda jerk.
We made milk shakes, frappes, and floats. A milk shake didn't get ice cream. A frappe did. A float had a scoop sitting on the rim of the glass and had a mixture of flavorings including cream and soda in the mixed beverage.
My favorite was a malted (a couple of teaspoons of malt added) mocha frappe. The more ice cream you add the 'better' the frappe.
I don't remember the recipe. Was it a squirt of chocolate syrup and coffee ice cream? or ..Was it a scoop each of chocolate and vanilla coffee with a chocolate syrup base? Whatever it was...it was cold and sweet and filling and tasty.