CNBC: Nickelodeon, the cartoon powerhouse behind “Hey Arnold!,” “Rugrats” and “The Wild Thornberrys,” could be in the process of developing a channel strictly for classic ’90s TV shows. Speculation from social media users has been growing since August, when company exec Russell Hicks revealed his interest in bringing back classic Nicktoons. Nickelodeon has remained tight-lipped about the project, releasing veiled messages on social media with the hashtag #TheSplatIsComing.