It's unreal that there is no info online about the Kellogg's Greencoats. For a cereal that sucked so bad, it didn't last as long as corn flakes, and those really suck. Pep cereal. I've never heard of it

https://forums.aaca.org/topic/341211-period-images-to-relieve-some-of-the-stress/page/318

Pep was a whole-wheat flake cereal introduced by Kellogg's in 1923. It became the cereal famous for sponsoring the popular radio serial The Adventures of Superman