They are called "hookah rappers"
Maybe famous but doesn't mean they're any good, the opposite more like
No, they are not known to anyone. The most popular Russian-speaking artists: MORGENSTERN, SCRIPTONITE, LITTLE BIG
Never heard of them. I'm pretty sure even young Russians more know who 70+ year old singers for 70+ year old people like Alla Pugacheva are, not talking about whole country