Dollification, or Doll Play is where a subject is willingly turned into a human doll.

This can range from play where a subject is 'dolled up' by being dressed like a doll and caring for the subject as a large doll - combing hair, changing outfits, cuddling with; to a subject being treated like an inanimate object, a living sex doll.

http://www.p-synd.com/winterrose/dollers.html

http://www.dollification.com/

http://dollsrealm.blogspot.com