The Adventures of Tom Bombadil actual translation from the "Red Book of Westmarch", and contains some background information on the world of Middle-earth that is not found elsewhere: e.g. the name of the tower at Dol Amroth and the names of the Seven Rivers of Gondor. There is also some fictional background information of those poems, linking them to Hobbit folklore and literature and to their actual writers (some of them are ascribed to Samwise Gamgee). The book uses the letter "K" instead of "C" for the /k/ sound in Sindarin (one of the languages invented by Tolkien), a spelling variant Tolkien used many times
Peregrin Took of the Fellowship and spend much of "The Two Towers" with their own story line. Impetuous and curious, he enlists (in "The Return of the King") as a soldier in the army of Gondor and fought in several battles during the War of the Ring. In the epilogues to the main story, Pippin returns to the Shire and becomes "Thain" or hereditary leader of the land before dying and being buried as a hero in Gondor. Peregrin was the only son and heir of Paladin Took II, the Thain of the Shire. His best friend Meriadoc Brandybuck, more commonly known