For the little jellyfish, you simply hit them with your sword a couple times or use the boomerang on them after you obtain it. If you meant the boss, you must destroy its tentacles with the boomerang and then stun the body with the boomerang; then hit it with the sword.
She is inside Lord Jabu-Jabu
Inside lord jabu jabu's belly.
Oh, Ok, I havent done that dungeon in a long time, but I'm somewhat sure that you have to throw your boomerang at the little jellyfish cause they freaking hurt if you hit them with ur sword. About the squid, im not sure but i hoped the jellyfish hint helped. :)
You don't kill Jabu Jabu yourself. However, after seven years pass and you become Adult Link, where Jabu Jabu is in Zora's Fountain is replaced by ice. There's no explanation for his absence, although it's possible that Ganondorf may have killed him.
catch a fish and dump it near his mouth.
Barinade is the boss of Inside Jabu-Jabu's Belly, the third dungeon in The Legend of Zelda: Ocarina of Time. This parasitic organism is revealed to be the cause of Lord Jabu-Jabu's gastrointestinal distress. It appears to have a symbiotic relationship of some sort with Bari.
Go inside the dragon looking fish in zoras cave, it's in Lord Jabu-Jabu stomach when you are young Link. There is a room with tentacles blocking your way almost everywhere. But there is one door you can go and you have to kill all monsters in this room and you'll get the boomerang.
You have to be an adult, Most of the ground will be frozen and jabu-jabu will be gone. Just navigate the ice and make it to the cave.
I am not sure this is what you meant but to get into Jabu-Jabu you take a fish and put it right in front of his mouth
Ja Bu Ja bu is also known as the mighty petar who saves little noor and then a goron named hana who comes and gives them flowers and then you can kill him with the flowers
You get the boomerang while you're a child in Lord Jabu-Jabu's stomach. It is obtained after beating the mini-boss.
The THird OOT boss is Barinade, Who you fight in Lord Jabu-Jabu's Stomach. He's quite easy. Really. Don't die when or if you fight him.