This thing isn't resin, it's injection-molded plastic, just like a normal model kit. In the LotR, Oliphaunt is a colloquial phrase used by hobbits and certain other men of the West to describe Mumakil. Mumakil is apparently the word used by the Haradrim for their huge war beasts, though Tolkien does not make this clear (he says so in an early draft of the LotR, but took it out in the final draft).
By the way, Oliphaunt is a real Old English word. It's where the word elephant comes from. It's roots are in the old Germanic word for camel, strangely enough.
This model comes with a bunch of Haradrim crew as well. Very impressive -- and the base -- which has dead Rohirrim and their horses and equipment strewn all over it -- is a beautiful model in its own right. It's meant for gaming, but with a little work it would make a very impressive display model. It would certainly tower over that 1/72nd scale Extratech M10 which set you back $35!