No they are not. They are not Mormons anymore than the RLDS, or the campbellites, or the Temple Lot people, or any of the other breakoffs are Mormons.
We will only see it often because people like you have an interest in saying it.
LDS are not Mormons either. It is a nickname, so yes, FLDS members are fundamentalist Mormons. They believe that Joseph Smith was a Prophet of God, and Brigham Young, and John Taylor. They follow the standard “Works” (scriptures) of Mormonism - the Bible, the Book of Mormon, the Doctrine & Covenants, the Pearl of Great Price. In fact they will argue that it is THEY and NOT you LDS, that are the “true” Mormons.
We’ve seen LDS members argue on FreeRepublic, that they are not, in fact Mormons, but are Latter-Day-Saints.
But go figure, obviously you don’t want to be connected to them, yet here you are, condoning polygamy as Biblical.
You Mormons are a funny bunch. Funny, as in strange....not as in ROTFL.