League of Legends (LoL) Question: Who are some underatted junglers in today's tank meta?

Nunu & Willump. He is a top tier pick and rivals with other cinderhulk junglers (Grag, Seju) but is often looked down in comparison between them. Great pick against hypercarry adcs which are a thing atm. I see him really rarely in ranked for some reason.

Second one is Nautilus.

Consider Olaf. He got a buff to his ultimate recently, and that combined with a possible righteous glory, ghost, and chilling smite would mean that he can stick on to targets, and providing they are squishy, kill them.

With his ultimate on, he is hard to kite, especially if you get hit by a single axe.

Risky clears relying on yourself to be low to get extra attack speed.

Rek'Sai works pretty well with Enchantment: Juggernaut + Black Cleaver and then pretty much going tank from there. She also has the positive aspect of not really caring about Blue Buff so can readily donate that.

Zac I think is underrated. Though he does get low on health he can clear the entire jungle without using a health pot if you know what you are doing. You can even do dragon at level 3 with him on top of doing a full clear, also with no health pots. He can also show up in lanes from unique angles thanks to Elastic Slingshot and is good at disrupting front and back lines with Let's Bounce. Unstable Matter does percent maximum health damage which is lovely for dealing with other tanks and of course Cell Division lets him get away with some crazy stunts that other junglers without a similar passive simply can't afford to try.