The Chocolate Quest Wiki

Grog is an item sold by Innkeepers that gives you fire resistance when consumed.

Grog will not be Found in the creative inventory, as it is just a renamed version of the Potion of Fire Resistance from Vanilla Minecraft! It costs 64 emeralds, and is sold in the Inn, Dwarven Bazaar, and Market.

There are a few NPCs who will request Grog for certain rewards, like joining your team for instance.