Of course, as always in this kind of topic, the question arose as to whether or not he's a gargoyle. The simple answer is: no.
I have two sources to back me up in this discussion. The first is my architectural 'bible' The Penguin Dictionary of Architecture and Landscape Architecture. ( I use the 1999 paperback, fifth edition for anyone who's interested.)
|This is a gargoyle|
|This is a grotesque|
|This is a corbel|