DreamWorks and producer Frank Marshall are teaming to develop the horror-thriller “Cropsey” through his Kennedy/Marshall Co. banner. Richard Naing and Ian Goldberg, who will also write the screenplay, are behind the project which will center on a group of adolescents at a summer camp haunted by an urban legend that dates back to the Colonial period. The tone is said to be an Amblin-esque project mix of horror and humor.