jabu huh...well, its not really the right forum to ask this but ill tell ya anyway...
in oot just find the bottle with the note inside (its in lake hylia) and show it to the fat blob (aka 'king zora') then run past him and there jabu is.
Hilarious... íf you are having trouble getting in contact with Jabu, if he refuses to open his mouth, try catching a fish in a bottle and toss it to him, I am sure it will do the trick for you...