BOSTON–(BUSINESS WIRE)–Something wicked is brewing at Dunkin’. Beginning today, the brand is kicking off spooky season with the debut of all-new Green Apple Dunkin’ Zero and Purple Marshmallow Cold Foam, two limited-time offerings that serve as the foundation of an all-new lineup of Halloween-inspired beverages.From tart apple twists to purple-topped creations, the menu marks the first chapter of Dunkin’s Halloween celebration, setting the stage for more surprises throughout October.Green Appl