can i make a mold of a plastick doll using paper mache? and can i usehot glueas the form in the mache mold?


In theory, sure. I'd think that the biggest challenge would be finding a mold separator that will allow you to separate the mold halves, and that will keep the hot glue from sticking to the mache.
Your best bet is to make a few simple test molds and try it out to see what works best for you.