Gandalf
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No, not at all. The Hobbit (even though it came out after Lord of The Rings) is a companion novel to the Lord of the Rings, they occur in the same universe, although The Hobbit predates the events of LOTR.
Trolls are much bigger than dwarves and hobbits, at least in Tolkien's world of Middle Earth. They are almost the equivalent of giants. They could pick up the hobbit with one hand.
Someone that can change from human form into something else. In The Hobbit Beorn was a shapeshifter and could turn into a bear.
The elves in "The Hobbit" did not know how the dwarves could have travelled there. They thought the barrels were all empty.
Yes, he could and he held a long conversation with Bilbo. Bilbo unknowingly gave a lot of information that he shouldn't have and Smaug revealed a weakness.