Are fuuma shurikens real

Yes, the fuuma(fuma or Fuhma) shuriken was allegedly created by a ninja of the fuma clan named Fuma Kotaro. What it originally looked like, or how it worked is unknown, what is known is that the shuriken was 4 pointed and collapsible. The ones you see in anime such as Naruto or games like Ninja Gaiden are stylized takes on the weapon, but it is said to exist in history. even if only once.