I grew up believing a Roy Rogers was simply a Shirley Temple served to a boy. That's what the waitresses at Danny's Spaghetti House in Silver Spring, Maryland used to tell me. Now I know they were just trying to protect my young masculine ego. They're two different drinks. A Shirley Temple combines ginger ale and grenadine whereas a Roy Rogers swaps the ginger ale for cola. I got my recipe from Mocktails by Kester Thompson. Don't know if you can quite see it in the photo but there's a cherry garnish in there, too.
Naturally, the drink is named for the King of the Cowboys:
The drink is fine. The flavors don't combine as nicely as ginger ale and grenadine. One tastes a little fruitiness but the cola overwhelms. You don't get the color effect either. Maybe more grenadine would have made more of a difference but not sure it's really worth it.