Friendly’s, the famed maker of Fribbles, is switching from scoops to supermarkets as a way to boost its struggling ice cream business and expand the brand across the country. While the Wilbraham company’s restaurants have attracted attention lately for their failures - about 100 of 500 locations closed after the chain filed for bankruptcy protection in October - Friendly’s has been doing better beyond its own walls, signing ice cream contracts with major retailers such as Walmart.