Which breakfast cereal brand has used the famous tagline "They're Gr-r-reat!" for decades?

In the competitive world of breakfast cereals, taglines and slogans have become iconic parts of food marketing history. Some have remained unchanged for decades, becoming as recognizable as the products themselves. This poll tests your knowledge of one particularly famous cereal slogan that has stood the test of time and become embedded in popular culture. Can you correctly identify which breakfast brand this classic tagline belongs to?

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Frosted Flakes (Tony the Tiger)
Lucky Charms (Lucky the Leprechaun)
Cocoa Puffs (Sonny the Cuckoo Bird)
Trix (Silly Rabbit)