Klondike Bars Aren't All Real Ice Cream. So What Are They? - Tasting Table
Briefly

Despite its widespread perception as ice cream, Klondike bars are technically classified as 'frozen dairy desserts.' The confusion arises from marketing and ingredient listings.
The ingredients in Klondike bars reveal their classification: they start with nonfat milk and include oils and sugars, lacking the required milk fat to be labeled as ice cream.
Read at Tasting Table
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