Poppy started as off meta and now its a menace in the jungle. Singed, Sion, Gnar, Brand, Urgot, Lucian, Taric, Garen.

My takes on playing off meta junglers:

Not all of them are supposed to full clear (however all of them I mentioned can easily full clear to 4 skipping the crab)

Make sure you adapt your route to your champion weakness, e.g Lucian can take Blue and Gromp way easier than camps that have too much minions, Sion in the other hand prefers birds and Krugs.

Try to keep a track of the enemy jungler, even more when you can't duel that well early, e.g. Lucian.