J.R.R. Tokin is a creature who can exist on any level of Caverns of Creation, and can be any kind of creature. He is the player's only source of pipeweed. He is never hostile, even when taking the form of a typically hostile creature. If the player uses the identify command, the game will say "This is a (Composition Type) (type of creature) named J.R.R. Tokin."
Tokin is obviously an homage to J.R.R. Tolkien, the English author who invented fantasy fiction as we know it.