The Comfortable Camel was an animal outside of the Land of Oz who found his way into Oz and joined Dorothy Gale's party to find the Scarecrow.
The Comfortable Camel was traveling with his friend the Doubtful Dromedary when they got lost in a sandstorm and ended up in Oz near the Deadly Desert. There, they met Dorothy Gale, the Cowardly Lion and Sir Hokus of Pokes, who were on a journey to find the Scarecrow. Not caring where they went, the two animals joined Dorothy's party and accompanied them to the Silver Islands, and then back to Oz. (The Royal Book of Oz)