I just think someone mixed up mythology and folklore with Tolkien-fantasy, there's really no point dwelling on this when we all know the OP meant the Tolkien-fantasy version of them.
For the wyvern though I'll have to agree with the OP. It is one thing to take the minotaurs, alter the models and call them Taurens, since that is a new name not included in the classic fantasy, but what they did by calling those wyverns is more like taking the minotaurs, a well established model, and name them gnome or whatever.
P.S. The trolls in my mind will always be the pre-Luclin models in Everquest.