Bilbo Baggins was famously a hobbit, not a dwarf.
No they are not. Bilbo is simple hobbit from the Shire, Thorin is a dwarf.
Dwalin
Balin, the only dwarf who seems to give a concern to Bilbo's physical and mental wellness.
Dwalin is the dwarf most surprised to see Bilbo in Chapter 5 of "The Hobbit." He reacts with disbelief and questions Bilbo about how he reached their location.
In Tolkien's "The Hobbit," after he had found the cells of the other twelve dwarfs, Bilbo overheard the guards talking about another dwarf, who he guessed must be Thorin. By using the ring, he was able to follow the guards, undetected and find the cells of each dwarf.
He cannot be mistaken for a dwarf, as he does not have a beard.
Which time? By the trolls? That would be Balin. By the spiders? We don't know from the story. By the elves? That would be Thorin.
With Gandalf and the dwarf Thorin Oakenshield, and his company of twelve further dwarves.
In The Hobbit, Bilbo Baggins joins an adventure along with Gandalf and the dwarf party and takes a ring from Gollum. He then begins a journey with a group of travelers to the Lonely Mountain.
After Bilbo puts on the Ring and turns invisible, Gollum cannot find him, and thinks he has made his way towards the exit. Gollum heads to the exit and Bilbo follows him.
In chapter four of The Hobbit by J.R.R. Tolkien, the dwarves and Bilbo and Gandalf the wizard are in the goblin tunnels. At the end of the chapter, a group of goblins sneaks up on Bilbo's party and one of them grabs hold of Dori, who happened to be carrying Bilbo. Bilbo then falls off of Dori's shoulders and knocks his head on a rock, and blacks out.