Doug Herzog Wednesday was named president of Spike TV by Herb Scannell, president of MTV Networks Group, replacing Albie Hecht, who resigned over the weekend. Spike will continue to report to Mr. Scannell, while. Mr. Herzog, who is also president of Comedy Central will also report to MTV Networks Chairman Judy McGrath. Mr. Scannell said that he and Mr. Herzog agree that Spike needs to concentrate on fewer and bigger projects to find a signature original hit.