Add more friendly ocean creatures

[Cucuber]

The ocean updates have added more and more life, most recently the Marotters. I like them, they are mischievous and spice us the coast. But they are, by design, a little annoying. Same as Skittersquid, Gnarwail and Rockjaw. Even though they can be a pain under specific circumstances, I still enjoy seeing them because they make the ocean seem alive. But I feel like the ocean needs more creatures that are friendly, maybe they give some good resources or help the player in some way. This will make the ocean feel more neutral, some annoying creatures and some helpful. Therefor making if feel more lively.

[gaymime]

i like skitterquid and dont really have scuffles with them. they are cute<3

[Well-met]

frostjaw is hinted to be recruitable, if klei ever finishes him