The file
There was, and it came with the logo's no-ghost sign on the box and marshmallows shaped like ghosts inside. Ralston reworked it as The Real Ghostbusters cereal when the cartoon hit, adding Slimer marshmallows.
Like most Ralston licensed boxes it ended when the show did. It's remembered alongside Ecto Cooler as the breakfast half of the same green-slime childhood.
Sources: Wikipedia — Ralston Purina (cereals)
