Um...yes? I think. There's four of them, for each big island! And everyone respects them because they've been the guardians for a really long time! But I don't think they're like the Storyteller...they can't really talk.

[ YEP, REASON 1: TAPU KOKO CAN ONLY SAY 'KOOOOOOOOOOOOOOOOOOKO', and storyteller has spoken actual words. Obviously they are not the same. ]