Which breakfast cereal mascot was the first to use the catchphrase 'They're Gr-r-reat!' and in what year was this character introduced?

Breakfast cereals have been using mascots for decades to build brand loyalty and recognition, especially among children. These characters have become cultural icons, with some dating back to the 1950s. Behind these friendly faces are sophisticated marketing strategies designed to create emotional connections with consumers from an early age. How well do you know these famous brand ambassadors that have helped sell billions of boxes of cereal worldwide?

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Tony the Tiger for Kellogg's Frosted Flakes, introduced in 1952
Cap'n Crunch for Quaker Oats, introduced in 1963
Toucan Sam for Froot Loops, introduced in 1959
Snap, Crackle, and Pop for Rice Krispies, introduced in 1941