Here are three growing companies that could deliver explosive returns.Investors can multiply their money by holding shares of well-chosen growth stocks, and three fool.com contributors are here to show you three incredible opportunities.Here's why Toast (TOST 5.57%), Sweetgreen (SG 6.16%), and On Holding (ONON 2.56%) could be monster winners.Restaurants need Toast's softwareJohn Ballard (Toast): The restaurant industry has become more competitive than ever. Customers can conveniently order takeout with thei ...