Nargott
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Naturally, Trolls are mountain giants, not Dwarves.
A Dwarf, by definition, cannot exceed 1.5 meters in height; Trolls are 3 meters tall.
Dwarfism implies a height below 1.47 meters, which corresponds to Dwarves.
Gigantism implies a height above 2 meters, which corresponds to Orcs.
And by the way, it has already been established that the reason for the enormous growth of Orc leaders is that they belong to a separate, large breed of Orcs (Ogres), and not the result of pharmacology (the key factor is the greater number of fingers on their hands).