Snoligoster

The Snoligoster (not to be confused with the Snallygaster) is a frightening creature inhabiting the impenetrable swamps of the southern states.

Its frame is not dissimilar to a crocodile with a long body, sickly green skin, tooth-filled snout and menacing yellow eyes. However, the Snoligoster bears features unparalleled by any crocodile or alligator. Its back is covered in glossy dark hair from head to tail, and it has no feet or limbs - just one long tail ending in 3 bony plates which it uses to propel itself through the water and mud.

Not only that, because protruding out of the creatures back is a long and treacherous spike which it uses to impale unwary prey from below the murky water.