Which cereal mascot famously declared "They're Gr-r-reat!" in television commercials that began in the 1950s and continue today?

Test your knowledge about one of the most successful marketing campaigns in breakfast cereal history! Great advertising catchphrases become part of our cultural lexicon, with some remaining recognizable for decades after their initial run. This particular slogan helped transform a cereal brand's identity and created one of the most iconic mascots in advertising history. Can you identify which famous character delivered this memorable line?

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Tony the Tiger (Frosted Flakes)
Toucan Sam (Froot Loops)
Cap'n Crunch (Cap'n Crunch)
Snap, Crackle and Pop (Rice Krispies)