were does this character appeared?
In a poem called "The Adventures of Tom Bombadil" and as a supporting character in the high fantasy epic novel "The Lord of the Rings".
Tom Bombadil
Tom Bombadil is a character in J. R. R. Tolkien's legendarium. He first appeared in print in a 1934 poem called "The Adventures of Tom Bombadil", which also included the "Lord of the Rings" characters Goldberry (Tom's wife), Old Man Willow (an evil tree in Tom's forest) and the Barrow-wight, from whom Tom rescues the hobbits. They were not then explicitly part of the older legends that became "The Silmarillion", and are not mentioned in "The Hobbit".

Bombadil is best known from his appearance as a supporting character in Tolkien's high fantasy epic "The Lord of the Rings", published in 1954 and 1955.
who played tom bombadil in lord of the rings He was played by Norman Shelley in the 1955–1956 BBC radio adaptation of "The Lord of the Rings". what is this character in the film? The character was not present in the movie adaptations of "Lord of the Rings"
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Tom Bombadil [SEP] Introduction
In the first volume, "The Fellowship of the Ring", Frodo Baggins and company meet Bombadil in the Old Forest. This idea and an appearance by both Old Man Willow and the Barrow-wight were included in some of Tolkien's earliest notes for a sequel to "The Hobbit". Bombadil is mentioned but not seen near the end of "The Return of the King", with Gandalf planning to pay him a long visit. Bombadil was omitted from Peter Jackson's film trilogy, and from some other film and radio versions of "The Lord of the Rings", as not essential to the story. Commentators have debated the role and origins of Tom Bombadil.