Is Riven jungle a good pick?

You get a jungle build if you bring smite. While you can definitely play any champion you want in the jungle, Riven's lack of sustain and strong laning makes her a better choice for lanes.

Sure you can do it. But why would you waste her level 3 and up dueling power fighting red buff.

Riven jungle is not a good pick.

I mean. If you feel like it I guess.

If you know how to fast Q you can clear camps barely losing any health.

But you take away from your team unless your top is a tank so I wouldn't suggest it.