The word dodongo could refer to a monster from The Legend of Zelda game or the monster from the TV show Ultraman.
Go to Dodongo's Cavern on Death Mountain and defeat King Dodongo. Hope i helped!
In Dodongo's Cavern.
Ahoy, there. o/ Queen Gohma (Inside The Deku Tree) King Dodongo (Dodongo's Cavern) Barinade (Inside Jabu Jabu's Belly)
You get the bombs from Dodongo's Cavern in Death Mountain.
I added a "related link" that might help you... It's an Ocarina of Time walkthrough that's still being worked on, but is finished with up to right after Dodongo's Cavern! It's on my favorite Zelda site.
Put a bomb in the center of the room.
King Dodongo is quite simple. Wait until he opens his mouth and throw a bomb in it. Give him a good couple of slashes and run close to the middle stage.( near the edge of the lava) wait for him to roll into a wall then repeat the process.
Keep heading through the temple freeing the gorons and after you get the hammer(I'm speaking about fire not dodongo, Incase you're talking about dodongo) The first room of the temple- Smash the statue next to the stairs, Head through some more- Boss key next to goron
throw a bomb flower from the cliff, you do need to get the goron bracelets from darunia in goron city
Dodongo's Cavern is on Death Mountain Trail hidden behind a giant boulder. To remove the boulder you must obtain the Goron Bracelet from the goron leader Darmania. Then use it to grab a Bomb Flower outside the village and throw it down onto the boulder, behind the boulder is the entrance to Dodongo's Cavern.
You have to beat the boss and finish the dungeon. When you come out, a cut scene comes on and Darunia (the god of the Gorons) and he give it to you.
The second monster you encounter is usually the Skulltula, as you run into Deku Babas on your way to the tree. The second boss is King Dodongo.