Which cereal brand first used the slogan 'They're Gr-r-reat!' in their advertising campaigns?

Test your knowledge of famous food brand marketing campaigns! Brand slogans are powerful tools that have shaped consumer behavior and product recognition for generations. Some food and beverage slogans have become so iconic that they've entered our cultural lexicon. This trivia question focuses on a particularly successful slogan that helped transform a breakfast cereal into a household name. Think you know your food advertising history?

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Frosted Flakes
Lucky Charms
Cocoa Puffs
Cap'n Crunch