I think they would love to be called Cocoa :D
But to answer to your questions; I've taken to calling them the "Critic" or Cocoa critic, they are canonically just an entity, so not really a human, just humanoid, who is really serious about cocoa. So they don't have super-official name or anything, just what is the vibe at the moment, though inside the game files I've called them "Dar" lol.