The Hobbit: What Strange Creature Gives Bilbo Away To The Trolls?

gamerant.com:

It is no secret at the start of the first Hobbit movie An Unexpected Journey, that Thorin is dubious by Gandalf’s choice of burglar. In fact, much of the first film centers around Bilbo trying to prove himself to the dwarves, which he does in many spectacular ways. Gandalf knew right from the very start that Bilbo had a loyal heart, a lust for adventure, and more skill and bravery than anyone could have guessed, but Bilbo not only has to prove this to Thorin, he also has to prove it to himself. He has gotten used to his quaint and idyllic existence, but in doing so he has lost the spirit and the heart that makes him such a wonderful character, and he certainly has to go through lots of exciting and dangerous times in order to find it.

One such example is right at the start of the quest, when the company of Thorin is making their way through the lands surrounding The Shire, in the direction of Rivendell. Here, they encounter 3 large trolls who have come down from the mountains and started causing trouble. This trouble, of course, famously includes stealing some of the dwarves' horses and involves Bilbo being sent to steal them back. He is the company’s burglar after all! This is a little bit of a trial by fire for the poor hobbit, who, thus far, has never actually stolen anything in his life, but doesn’t want to admit that in front of such esteemed and well-respected dwarves, especially ones who already doubt his capabilities.

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So, rather than making the sensible choice and admitting that he doesn’t know what he is doing, Bilbo decides to take this opportunity to demonstrate his courage and show them what he is made of. Although this wasn't included in the movies, in the