I am developing a fantasy universe. In it, then there are 6 Continents (Excluding Mapiya, which is in the sky): Agricet (Asia), Aztlan (Pre-colonial Meso/South America), the Biting Glaciers (The Arctic), Meristolem (Africa), Mystikicis (No real-world comparison, as it's essentially Atlantis if it didn't sink), and Skatallo (Europe).
In-universe, there's a racial group known as Boga, or simply Goblins as humans call them. Within this racial group, there's the Chernoboga (Hobgoblins), the Sekirboga (Bugbears), and the Vulboga (normal Goblins, which are called Vulgar Goblins, or Common Goblins). Although the Chernoboga and Sekirboga are peculiar to the subcontinent of Silboga (Just in-between the Siberian-inspired area and the Chinese-inspired area), the Vulboga can be found on any continent in a variety of subspecies.
For any additional context; Meristolem is largely dominated by a region known simply as the Blistering Sands, where the climate is inhospitable to most life forms, and the most monstrous and evil things reside, including an empire of very powerful slavers, known as the At'Azraqa. There are others like Ogres, Demons, Wyverns, and so on. The Biting Glaciers are a similar situation, only as a frozen wasteland. Aztlan's southern portion is a similar location, only in the form of the Savage Jungles.
Mystikicis is densely urbanized and has many port towns. It is home to a highly advanced society in terms of Magic and Technology.
My question here is as to likely subspecies of Vulboga that would develop for each continent, as every continent is supposed to have a subspecies of Vulboga present. What would be their physical traits in comparison to one another, and what would be the most prominent features to make them worthy of being of a different taxonomic classification from one another?