Relevant text: Fetish Mask (Su)
At 1st level, a scarred witch doctor forms a bond with a wooden mask. As she gains power, her connection to this mask causes it to grow ever more hideous and grotesque as it absorbs the weight of the self-induced pain that underlies her magic. Her spells derive from the insights her patron grants her while she's enduring the cuts, burns, and other sorts of mutilations she inflicts upon herself. Her fetish mask acts in all ways like a witch's familiar for the purpose of preparing and gaining spells. Rather than communing with a familiar to prepare spells each day, a scarred witch doctor hangs her mask on a wall, tree branch, or something similar and contemplates the agony it represents.
This ability otherwise functions like and replaces the standard witch familiar.
|Earl of the Malebolge|
"Her fetish mask acts in all ways like a witch's familiar for the purpose of preparing and gaining spells."
Being an object, and not a living familiar, it would make sense that it does not gain skill ranks/feats. Instead the mask acts as a conduit to the witch's patron so that she can prepare spells like vanilla witches.
So to answer your question, no it does not gain skill ranks/feats.
If you animate it as an intelligent object it definitely would. Other than being an object it "functions like and replaces the standard witch familiar."
So if it gained intelligence it could do all the things normal familiars could do (aside from move, unless it had the appropriate power for that)
Though speak with others of its own kind would be a little weird.
|Lost In Limbo|