Mountains are DPS, not tankly. Anyone who tries to tank a mountain deserves the beating they're about to receive. Why? Mountains have no innate damage mit past fence, and oceans even do that better.
Oceans, on the other hand, get legend whale and legend crab, along with solid fencing. Stack some relatively easy to acquire minor limdams on top of fence and legend crab, with whale's innates helping in various ways, and you have a tank that dodges most things, heals every round a small amount and 200+ hps on a timer, reduces what he doesn't dodge by a *significant* amount, paralyzes on a timer... it's fairly filthy. Only problem is that scout rescue is not unlike winning a gold in the Special Olympics: even at superb, it requires significant help. :)
I'm not saying I'd main tank a scout over, say, a solid warrior, but I did have quite a bit of success on Ix.
Jason