Sludge
Long body, body is made of all sludge.
Powerful stink.
Produce toxins in the body.
Body color varies depending on sludge. Toxin is strong enough to be purple.
I like dirty things, settle down and sewage swamp, river, etc. mainly groove.
Melt and fall into the water. After the melted water turbidity dirty.
If it is possible to swim in the mud and sludge.

Tar
Body is made of all tar.
High intelligence, it is possible using a tool or speak the language.
However, most can not speak, s using telepathic communication.
Also known as tar doll for that.
Build a house in the swamp tar, are living in droves.
That basically all the same shape,
Length of the flock is eye shape is different, has a cape and cane.
Cane is made of tar also cloak also, of course.