[King of the North]

I just finished reading the LotR for the 10th time or something. I noticed this, the Frodo from the books is different from the Frodo in the movies. Obviously there will be some changes in the character, due to the transition from book to film, but I though that the whole character was different. So here is my question, do you think that the Frodo from the books is different or far different from the movie Frodo, please state the reason for your answer.