This fire troll is encountered near the end of Chapter 14: Between The Realms. Its attack patterns are very similar to the fire troll you fought in Wildwoods and Veithurgard. Evade its attacks and counterattack with runic attacks, especially to its head. Even Atreus arrows can deal significant damage to it so keep shooting whenever you can.
Its jumping stomp is an fire-based area attack so getting up close and personal will be quite risky and dangerous. When stationary, its stomp can summon a fire blast right underneath where you’re standing so keep an eye on the group and react immediately to avoid getting damaged.