Ecthelion vs 100 trolls???

[Hookbill the Goomba]

I am sorry to say, Gothmog, but I think you have been deceived, for Ecthelion 1st was the steward of Gondor who rebuilt the tower in Minas Tirith.

The seventeenth Ruling Steward of Gondor, who succeeded his father Orodreth to the Stewardship. He is most famous for rebuilding the White Tower that surmounted the city of Minas Tirith, which was afterwards known as the Tower of Ecthelion. He ruled in Gondor for just thirteen years, and was succeeded by his son Egalmoth.
The encyclopaedia of Arda, entry on Ecthelion I "The Steward who rebuilt Minas Tirith’s White Tower"

No other account is given of his actions.

Ecthelion II on the other hand was;

the son of Steward Turgon, and was a wise and foresightful Man. He put his efforts into strengthening his realm against the approaching danger of Sauron, who had openly revealed himself in the last years of Turgon's Stewardship. He was aided in this work by Gandalf, and by a mysterious stranger named 'Thorongil', who was later known to be none other than Aragorn. Ecthelion was succeeded as Steward by his son Denethor II, who ruled Gondor at the time of the War of the Ring.

There is nothing about slaying Trolls... not 100 of them anyway.