[The Half-Hobbit]

When Treebeard first saw Merry and Pippin, he was drunk from too much Ent-draught, and he thought Merry was a beautiful Entwife. Driven mad by the thought of such a sexy female Ent with Pippin (whom Treebeard thought was a very strange type orc/shrew crossbreed devised by saruman), he challenged Pippin to a duel, the winner of which would have Merry's hand in marriage. Of course Pippin agreed to this, because he is a fool of a Took. However, in a surprising turn of events, Grishnack (spelling?) arrived, miraculously alive despite having been killed by riders of Rohan not too many pages ago, and defeated both Pippin and Treebeard. He and Merry now have a lovely home by the Dead marshes where they will soon be having their third anniversary party.

Who or what is Grima the Wormtongue?