"Cartoon Dollz" is just one of the many nomenclatures used for a particular hobby of many graphic artists. A woman by the handle "Shattered Innocents" is considered by many dollers to be the creator of the hobby.
Once a creative outlet in the Palace chat software, Cartoon Dollz have expanded to find their way into many community outlets such as online forums and clubs. Just by doing a basic internet search will turn up hundreds of pages.
Dolls range in size from just a few pixels high to a few hundred. Many beginners usually start with a base body created by another, while many experienced dollers create and share their own bases while still also using others.