Once you finish your quest within the Forest Temple, you will find yourself in a large chamber with an enormous tree known as Old Mawood. He has Halis, Kameo's uncle, inside of his branches, and it is your job to rescue him.

As the battle begins, you will find explosive shells around the area. Use Pummelweed's uprooter technique and go under the shells, move them towards Mawood, bust out of it, and it will hit the ol' tree.

Old Mawood will then shake his branches, and trolls will fall out. I suggest that you kill them with Rubble. That is, of course, if you have spiked rocks equiped to you. If not, use Pummelweed to take them out.

Eventually, Mawood with open his mouth, laughing. As his mouth is open, use Rubble to shoot rocks into his mouth, and he will choke, thereby lowering his health.

Repeat this process until his health bar is empty, and you are victorious!