Although it shifted advertising for some of its brands to J. Walter Thompson , it kept Frosted Mini-Wheats with its long - standing agency , Leo Burnett .
Kellogg 's also planned new creative approaches to its advertising .
Although Kellogg shifted advertising for some of Kellogg 's brands to J. Walter Thompson , Kellogg kept Frosted Mini-Wheats with its long - standing agency , Leo Burnett .
Kellogg 's also planned new creative approaches to its advertising .