One posthumous work of this author was inspired by the Poetic Edda and was entitled The Legend of Sigurd and Gudrún, while his other posthumous works include one in which a wizard turns a dog into a toy and back again, and one which contains essays discussing Anglo-Saxon and Sir Gawain and the Green Knight.  
He discussed the derivation of the Middle English word for draught-horse from the Proto-Germanic root for energy and vigor in his essay "The Devil's Coach Horses", and contributed to the translation of the Jersualem Bible.  One posthumous work of this author was inspired by the Poetic Edda and was entitled The Legend of Sigurd and Gudrún, while his other posthumous works include one in which a wizard turns a dog into a toy and back again, and one which contains essays discussing Anglo-Saxon and Sir Gawain and the Green Knight.  For 10 points—name this author of Roverandom and The Monsters and the Critics, a British author who is better known for creating the characters Legolas, Gimli and Aragorn in his Lord of the Rings trilogy.
He discussed the derivation of the Middle English word for draught-horse from the Proto-Germanic root for energy and vigor in his essay "The Devil's Coach Horses", and contributed to the translation of the Jersualem Bible.  
J.R.R. {Tolkien}