The phrase "a doll which" is correct and usable in written English.
It can be used when referring to a specific doll and providing additional information about it.
Example: "I found a doll which has beautiful hand-stitched clothes."
Alternatives: "a doll that" or "a doll who".
I saw what looked like a doll, which fell on the ground.
When Amanullah returned, his house had been reduced to rubble, and the only trace of his family was a doll which his little sister had stuck on a tree.
I spent lots of time and research to create a doll which daughters are going to love.
"However, if skinny models in advertisements get so much scrutiny, I feel Barbie, a doll which million of girls play with, should be open to critique as well".
She's being terrorized by a gang of drug traffickers searching for a large quantity of heroin stashed in a doll which her husband, Sam (Efrem Zimbalist Jr ., unwittingly accepted from a woman on a plane trip.
On one large silver plate from 1859 (a portrait of a girl holding a doll, which is apparently a widely sought subject in the world of photography collecting), the stamped hallmark reads "Christofle," well known today as a manufacturer of fine silver products.
Soon thereafter, Handler returned from a trip to Europe with a "Lilli" doll, which was modeled after a character in a German comic strip.
Oh, and nearby stood a cackling witch and a boy doll, which the witch had turned into a little person.
In Zara, the dim lighting made my face look like that of a porcelain doll, which is always a plus.
He has a voodoo doll, which he stabs, mercilessly, with a hat pin.
These dolls open in the middle to reveal a smaller doll, which opens in the middle to reveal a yet smaller doll…and so on.
