Humanoids three times taller than humans might resemble large elephants standing on their hind legs. Elephants, of course, have intelligence similar to that of humans.
And elephants sometimes stand on their hind legs, though they usually like to keep at least three feet on the ground at any one instant. Bull elephants place their forelegs on the backs of female elephants for sex, thus six legs carry the weight normally carried by eight legs.
Large bull African elephants have been photographed rearing up on their hind legs to pull high branches down from trees to eat. An Asian elephant named Snyder was trained to walk in his hind legs with a woman standing on his tusks (with her head possibly higher than that of any other animal-riding human in history).
Due to the square/cube law, a human three times taller than average would have 27 times the mass of an average human but his bones and muscles would have only 9 times the cross sectional area, so their strength relative to weight would be only a third that of a normal human if they lived on a planet with Earth normal gravity. Thus humanoids three times as tall as normal humans would need bones and muscles much thicker proportionally than normal sized humans have, and would tend to be built vaguely like elephants walking on their hind legs.
Thus is possible, though not certain, that such giant humanoids would be as strong as elephants, and could do elephant like deeds, such as throwing small tree trunks at their enemies, and picking up and throwing animals as large as horses, bulls, and rhinos.
If a human-sized person hid in a small wooden shack, a pursing giant humanoid might pick up the shack and throw the shack far enough for it to splinter when it hit the ground, just as elephants have been alleged to thow small wooden buildings.
If humanoids three times as tall as humans were built like elephants and were as strong as elephants, human sized natives of the planet would need strong fortifications around their communities to keep the giants out. Just as elephants can break into most individual human buildings on Earth, giants as strong as elephants could break into most buildings built by smaller intelligent beings.
Since elephants have been trained to hold swords in their trunks and fight with them, giant humanoids could certainly use large swords. Elephants were also sometimes trained to swing large heavy chains from their trunks, and those might also be good weapons for giant humanoids.
The giant natives would seem normal sized to themselves, of course, so I don't know why they are are planned to be three times the size of humans. On a planet with Earth-like animals the giant humanoids would be the largest land animals and would not need weapons to deal with predators as much as humans do on Earth. Maybe there are larger predators on that planet.
But I suspect a logical use for the giant humanoids and their weapons would be in conflicts with smaller sized intelligent beings, whether native to the planet or vistors from Earth.