League of Legends (LoL) Question: Blind pickable jungle champions

Generally any champion that has utility if they end up behind and doesn't clear extremely slowly is extremely blind pickable. So Ivern, Poppy, Hecarim, Nunu & Willump, or Volibear are some of the better blind picks.

Definitely Hecarim, Nunu & Willump, Volibear, Nocturne, and Fiddlesticks are all good blind picks, because of their Utility, Crowd Control, ease of playing from behind (that's the only reason I wouldn't recommend Rek'Sai or Elise here, even though they're both strong at the moment), or just general good matchups into the meta champions. While I personally wouldn't recommend Ivern if you don't trust your teammates to carry, he's still very strong if you're coordinated and communicative. Hope I was able to help.

I think currently, Xin Zhao is one of the best because he can outduel almost any champion in the jungle and his ganks are really affective (as long as you hit his W). I also think Nocturne is good for similar reasons, and it is easy to gank anyone with his ultimate as long as you have vision on them.