What is "frappes"

Usage examples of "frappes".

I almost made a joke about creme de menthe frappes, but a black guy in a white jacket had materialized, a silver tray in hand.

Because old Mr Keene was a grouch and wouldn't let kids under twelve eat their stuff at the soda fountain (he claimed the pinball machines in the back room might corrupt them), they took the frappes in two huge waxed containers up to Bassey Park and sat on the grass to drink them.

I don't count Howard Johnson's, where I only had french fries and cheeseburgers and vanilla frappes with people like Buddy Willard.