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Okay some of us remember this guy, eh? Tony the tiger who advertised Kelloggs Frosties (aka Frosted Flakes) a fun cereal breakfast food much loved. His most famous catch phrase devised by John E Matthews is "They’re Grreat!" He was created in 1952 by Martin Provenson, the children's book illustrator and has been seen around the world.
Here's a clip: Kellogg's Tony the Tiger The Cowboy