Not right...

I found this in tv.com:
The título of this episode refers to the hypothesis that holds when robots and other facsimiles of humans look and act almost like actual humans, this resemblance causes a response of revulsion among human observers. The "valley" is a dip in a proposed graph of the positivity of human reaction as a function of a robot's lifelikeness and explains why almost-human-looking robots scare people más than mechanical-looking robots.
Here, instead of robots, are dolls.
but, yeah, maybe, another name would've fitted better.

I think the "Dollmaker" o the "Doll Collecter" would give too much away about the episode.
If tu see that título you'll know that there's an unsub who ofcourse uses humans as collectable dolls. tu know what I mean?

I agree that dollmaker o doll collector would be too obvious but uncanny valley really doesn't have anything to do with what the ep was about. hmmmm.....