Pony of Tom Bombadil. Fatty Lumpkin spent most of his time grazing in the hills of the Barrow-Downs. Fatty befriended Merry Brandybuck's ponies. They ran to him when they were frightened at the Barrow-Downs. He soothed them and sent them away. When the ponies were released at Bree, Fatty once again met them. He let them stay for a while, and then sent them back to Bree.