Yes but seeing as Stadler and Waldorf both start with the same letters as Saruman and Wormtongue...well, it is a bit of a stretch. Maybe Gandalf should be Pepe the shrimp, "That ring is very bad, ok."

Treebeard could be Sweetums (big brown shaggy guy with a couple of gold teeth); Tom Bombadil could be Dr. Teeth. Darn, I can't think of anybody for Eowyn; maybe she can be a human too seeing as I cast Faramir as a human.