If you are not in Pure World tendency there are 2, and they can both be taken out easily without damage to you. These strategies may be already known so I apologise if it's already been said.
1st Giant Goblin (at end of path after falling rocks)
Lure it out and back up path, climbing back to near vendor. Giant Goblin cannot climb the step near the vendor. Arrow/pole it to death.
2nd Giant Goblin (near boss fog at end of rope bridge)
There are 2 small goblins in front of it. Wear thief ring and shoot arrows at the Giabt Goblin behind them. Do not shoot the ones in front. Giant will be blocked by the others and will be unable to pass.
Obviously, they can be taken out without these tactics. But i found that I struggled with them on later NGs (even with Warding on) due to my SL being low.