Technically in the lore, Orcs are a variety of Elves, and some Orcs such as the Uruk-Hai are Orcs bred with Goblin-men, and all of these races can breed with humans. Elrond is only half-elven, for example. They’re all people, and technically all variations of humans due to that ability to interbreed.
As for how they are portrayed, yes there are plenty of Orcs of all skin colors in the movies and the show:
The point is that clearly you don’t care what skin color these people are regardless of where they come from, so my point stands. Why does skin tone homogeneity matter to the heroes but not to the villains?