What is the one word for doll witch

It's a maumet (mammet, mommet)...

a doll, puppet, scarecrow, or other figure built to resemble a human being.
Obsolete: an idol; a false god.

Etymology from dictionary.com...

C13: from Old French mahomet idol,
literally: the prophet Mohammed, from the belief that his image was worshipped.

It could also be called a gris-gris, particularly in the context of Juju (origin uncertain, but may refer to the French word joujou, which meant "doll" or "plaything").

For an adjectival form,...

"This doll is possessed!"
- influenced or controlled by something (as an evil spirit, a passion, or an idea)