We called it a freeze, not a frappe. A milk shake was a real milk shake. Milk and syrup — only. A milk shake with a scoop of ice cream mixed in was a freeze and a shake with a scoop of ice cream added afterwards was a float.
The all time best growing up was a Friendly’s Awful-Awful (they got sued and had to change the name to Fribble) It was so thick you could barely get it up the straw! Along with their burger on toasted bread and the fries, it was the quintessential place for teenage gourmet ( Beside the Grinder/Pizza place up on rte 151 and 28)