from SOURCE: Frozen food makers plan to launch their first national TV ad in defense of their products on Tuesday as the category fights to boost slipping sales. The ad will include the tag line “Frozen: How Fresh Stays Fresh” and is intended to address negative misconceptions people have about frozen foods. It’s part of a marketing campaign being funded by the American Frozen Food Institute, an industry group that represents companies including Nestle, which makes Hot Pockets and Lean Cuisine, and ConAgra, which makes Healthy Choice and Marie Callender’s.