Could a humanoid species exist with vastly different heights?

Many mythological humans vary in depictions. Let's use Trolls from Scandinavia as an example. Some are said to be giants compared to humans (I'd imagine twice the height), and some, like Danish Trolls, are said to be the same height or smaller than humans.

Same for other big species such as Ogres, Cyclops, and Orcs. They can either be twice the height as humans, or the height of a child. Considering the necessities of animals being huge (bigger heart, higher blood pressure,thicker limbs,etc.) How could a species biologically evolve and exist with such varying heights without Darwinism being in the way?

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Could a humanoid species exist with vastly different heights?

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