General Mills, one of the country’s largest food companies, last year revamped its frozen pizza brand, Totino’s, with black packaging and spicy flavors in an effort to appeal to millennials. The new Totino’s Bold products are marketed with zombie videos on YouTube instead of the picture of the matronly chef Rose Totino clad in red-and-white checkered apron that graced newspaper ads in the 1980s, when the target consumer was baby boomer mothers.