FALL RIVER — Towels, pillows and surfboards aren’t usually mentioned in the same breath. But it’s a solid match for a well-known Fall River manufacturer and a unique nonprofit group that uses surfing as therapy for children and adults with cognitive, physical and emotional challenges. The Matouk home decor and linen company, located in Fall River Industrial Park, is now the flagship sponsor of Gnome Surf, according to Christopher Antao, the Fall River native who founded the nonprofit surf-therapy group. Gnome Surf operates from mid May to mid October at South Shore Beach in Little Compton. Antao, executive director of Gnome Surf, said Matouk president and CEO George Matouk, president and CEO of John Matouk & Co has pledged financial support for his organization.