When you come across "witch goddess" it really depends on where you are finding it. There are a lot of older books on Wicca that just use the terms witch and witchcraft instead of Wicca or Wiccan. In some of these books, they are referring to the triple goddess concept within the religion. That is a goddess deity that is seen as the following: maiden, mother and crone. Many times these materials will class different goddesses from several cultures as fitting into these three categories. So in this sense, yes any goddess can be called upon. That is because many Wiccans see all the goddesses from ancient times as just different aspects of the one goddess....like different faces of the same person. Some Wiccans and Witches will find a particular goddess to work with as their main face of the goddess that they connect well with. For me that would be Danu from the Celtic traditions. Research all the goddesses you can and see if you connect to one yourself.
The only other reference I know of involving a witch goddess is related to Aradia or Diana. This is mostly with older traditional branches of Wicca and relates to a book called "Aradia, or the Gospel of the Witches" from 1899. However, it isn't commonly discussed much in the more modern traditions or books.