I watched the video last night and, after the credits which follow the film, where they show the goody bits, there is a shot of the mouse sat in a wood and canvas film crew chair, with a 'Mr Jingles' caption. Also, if you read the book by Stephen King, on which the film is based, you will see that it is Mr Jingles. I understand how one can believe that it is Jangles from listening to the film soundtrack because the name is sometimes spoken in a French/American accent (which I can't reproduce here)