Right now the only meta level 2 gankers are
and
, as far as primary playstyles.
can level 2 gank but not as well as xin, his level 3 spike is better, with xin and camille their level 2s and less reliance on level 3 just means there's literally no reason not to level 2 with them. They also can go crab - > gank - > crab reliably with the mid priority and their CC unlike say, kayn who doesn't level 2 well and doesn't take crabs that fast either.
and
level 2 but they're not really meta so its hard to recommend them. Shaco is basically just a OTP champion right now, and twitch is super easy to punish due to how weak his clear is, he's basically level 2, then offline until 4 items. He pretty much boils down to this; "can the opponent vertical jungle? Yes? Well I lost", its why you don't see him in high mmr because in high mmr everybody kinda checkmates him either by making the first blood gold even'd out in him losing camps and XP, or even killed, or by tracking him so lanes don't get ganked by him.
can do it but he hurts his clear speed if he doesn't take W level 2, unlike camille or xin who don't need their W to clear or fight. Without Q he doesn't have a way to go on the target, and without E he can't really gank, so overall there is too many drawbacks compared to the level 2 titans.