I am Not a Frosty Malt expert.
What I do know is Chicago Tribune reporter Paul Sullivan (In his "100 Questions for 100 Years" Cubs story) asks and answers:
-What is the tastiest treat ever sold at Wrigley Field?
-Frosty malts. As Steve Goodman sang: "Give everybody two bags of peanuts and a frosty malt, and I'll be ready to die."
That's Paul's #1 question. (Here's the full story, if you're looking for a fun Cubsy read)
The Frosty Malts pictured are the ones sold at Royals games. I also happen to know there are Frosty Malts at the Great American Ballpark. But that's about all I know. I'm hoping some Frosty Malts fans can write in and tell me about this sweet treat.