Just for your information, there's no such thing as a "fuji polaroid". Fuji and Polaroid are two separate companies producing different cameras and films. Fuji produces the Instax series of cameras and films while Polaroid produces the SX-70 series and many other wonderful cameras. Sadly, Polaroid has ceased all productions of their instant films.
So please do not link Fuji and Polaroid together. Please get your terminology right so that you do not get ridiculed at. Perhaps you mean Fuji instax series of cameras. To my knowledge, I do not know of a fisheye for Fuji instax cameras. Perhaps other gurus might be able to help out.