Uh. Sort of. Karkat is the expert on this sort of thing, but...I have been trying to explain it to another human for a couple years now.

[Not that she knew how much success she had been having with Rose. Or what was even going on with Rose, exactly.]

Moirail is very similar to friendship. When a more...stable troll...decides to take it under their responsibility to keep a less stable, more dangerous troll from causing...significant damage to themselves or someone else. Or destroying their other relationships.

But in essence, human friendship can be similar. It's just not quite as...defined.