Do the hodag, tripodero, giddyfish and White River Monster rate as contemporary American folklore? Daniel Cohen suggests they do, but on closer look he admits that for every ""authenticated tradition"" there are a handful of outright hoaxes, one or two genuine unsolved mysteries, and a host of ""manufactured traditions."" Cohen should know -- he's been hanging around monster territory for a long time. And he spins a good yarn while instilling in his readers a healthy skepticism about newspaper reports, rumors, and so-called Indian legends (that have popped up to support, say, mammoths in Alaska and the Cardiff Giant). So step right this way to meet the Abominable Chicken Man of El Reno, Oklahoma. . . . What's it worth to you?