Are Dwarves and Dark Elves the Same?

So in turn the answer is no Dwarves and Dark Elves are not the same. they were mixed together to be able to add in the realm of Hel. In Tolkien's Silmarillion the Dark Elves (Moriquendi) are definitely elves and distinct from dwarves.

Are Dokkalfar dwarves?

Since the Prose Edda describes the dökkálfar as being subterranean dwellers, they may be dwarfs under another name, in the opinion of a number of scholars such as John Lindow. The Prose Edda also uniquely mentions the svartálfar ('black elves'), but there are reasons to believe these also refer to merely dwarfs.

What is another name for Dark Elves?

In the Dungeons & Dragons multiverse, especially in the worlds of Greyhawk, the Forgotten Realms and Eberron, dark elves are commonly called drow. They are dark-skinned and white-haired and are generally, but not exclusively, evil.