Does anybody know if a mangá is publishable if it is only finished in Pencil? (meaning if it's not Inked)

If you find a publisher who is not a complete traditionalist.
I agree about pencil, you can do really good shading without worrying about drips and smears.

Image has published things that use unusual mediums.
They have one where the line-art is done with a thick paint brush.

There is a artist who uses a black colored pencil to draw manga.

here is a site that talks about self publishing comics:
link

I bought a manga/comic that was drawn completely in pencil shading (or at least it looked to be in pencil shading because of how the pics were shaded and how soft the line marks were). It's called Miki Falls written/ drawn por Mark Crilley and it was produced por Harpercollins. So I am guessing the answer is yes since Crilley does it in his works. Perhaps it will say what he uses to draw with on his website somewhere?... Perhaps you can even ask him por emailing him, cause I sent him a fã letter and he actually responded!

markcrilley.com