I don't think I ever heard this growing up as a Mormon, at least not as something considered as a serious belief. My Aunt quipped once how silly it was that my Granpda (also a Mormon) believed that 'the Jews planted dinosaur bones to discredit Christianity' - he's dead now and I don't know if he actually believed that, but it's possible that he did.
My experience growing up as a Mormon is that questions of how exactly God created the world are mostly left up to science. I haven't seen any hints of evolutionary science being considered 'taboo' with any seriousness in quite a long time.
My experience growing up as a Mormon is that questions of how exactly God created the world are mostly left up to science. I haven't seen any hints of evolutionary science being considered 'taboo' with any seriousness in quite a long time.