The term 'Hobbit whose best friend is Sam' refers to Frodo Baggins, a character from J.R.R. Tolkien's fantasy novel The Lord of the Rings. Frodo is a hobbit, a small humanoid creature, who embarks on a quest to destroy the One Ring and save Middle-earth from the Dark Lord Sauron. Along the way, he is accompanied by his loyal friend Samwise Gamgee, who serves as Frodo's companion and protector. Together, they form an inseparable bond that helps them overcome the many obstacles they face on their journey.