Probably better in the jungle, but he is likely good at early trading (tantrum passive means he can fight in minion waves and take a lot less damage), and he has solid all-in power at level 3 and level 6 (level 3 for a Q>W>E combo and then follow up damage, likely to force your opponent out of lane if not kill them if they were low, and 6 for basically the same thing but with his R as well for more guaranteed W damage). He would be very easy to gank for, similar to nautilus or malphite, and as always scales excellently into the late game (I would recommend picking up some tanky AP if solo laning so that you have more kill pressure and take advantage of your higher gold income as a top laner, possibly RoA/Righteous glory, Rylai's, Liandry's, etc.). Once you hit 6 you'd probably want to get your roam on with either teleport or an old fashioned gank.
His mana wouldn't be too big of an issue since you wouldn't need to use too many abilities unless hard pushing the wave, and you shouldn't be using Q except for an all-in. The largest downside I see is that he has no reliable way to escape a gank.