Hobbits can speak because they were able to talk to humans
There was no known language for the Hobbits. According to Tolkien "There is no record of any language peculiar to Hobbits." They spoke the langauge of the menfolk they lived near, usually the Common Speech, e.g. Westron.
No, Hobbits are fictitious characters
Hobbits are a product of fiction. They never really existed.
Yes, they are hobbits that live in the Shire.
Hobbits are also known as halflings.
Hobbits did not live in trees. The opposite in fact; they lived in holes in the ground. Some Hobbits lived in houses. Hobbits do not like heights and do not even sleep upstairs.
The three types of hobbits are Harfoots, Stoors, and Fallohides.
J.R.R. Tolkien created hobbits in The Hobbit and The Lord of the Rings.
Hobbits might exist just check out this article: http://www.independent.co.uk/news/science/the-foot-that-may-prove-hobbits-existed-1680405.html
I am sorry to say that Hobbits do not exist in the real world. So Hobbits cannot be mean in real life since they are not in real life.
Hobbits are famous for being small. They are also known for their great hearing and sight.
The term Halfling is used in some parts of Middle Earth to refer to Hobbits.