Which cereal brand has used the slogan 'They're Gr-r-reat!' since 1952?

Brand slogans are often as recognizable as the products themselves, becoming part of our cultural lexicon. Some marketing taglines have remained unchanged for decades, while others evolve with the times. This trivia question focuses on one of the most enduring breakfast cereal slogans in advertising history. Test your knowledge of this iconic phrase that has helped build brand loyalty across generations!

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Frosted Flakes
Lucky Charms
Cap'n Crunch
Cocoa Puffs