From Wiktionary, the free dictionary
From were- + crocodile.
werecrocodile (plural werecrocodiles)
- (fiction) A shapeshifter who can assume the form of a crocodile.
2000, Rosalyn Greene, The Magic of Shapeshifting, Red Wheel/Weiser, →ISBN, page 77:Werecrocodile legends are quire common wherever crocodiles are found.
2005, Kameron Franklin, Maiden of Pain: The Priests[1], Wizards of the Coast, →ISBN:As though responding to some unseen signal, one of the submerged werecrocodiles reared up in a spray of water and transformed into its human shape
2012, Ilona Andrews, “Retribution Clause”, in P. N. Elrod, editor, Hex Appeal, St. Martin's Press, →ISBN, page 32:The werecrocodile laughed at him, the feral grin of a predator displaying nightmarish fangs.