"greenman" in my book, can cover a lot....most anything boarding on the Pagan.
He is disgorging what looks like water in waves. If they are vines, there are no leaves attached
I'd say this is a classic Romanesque disgorger in the tradition of Garway (as featured in Phil Rickman's novel The Fabric of Sin), Bridge Sollars (which disgorges serpents), Leominster & (of course) Kilpeck. Thing is this stuff dates from the 12th century, whereas the term 'Green Man' in relation to such carvings is a mythconception dating to the 1930s. Lose the name; lose the prejudices; lose the 'Green' associations... and besides, he is disgorging foliage!
Now then , this is not a greenman , more a merman or a masculine ondine.....
I agree. Looks more aquatic than wooded.