gowk yon halfling be,'" Hauau sighed." (The Merman's Children, p. 108)
This phrase echoes Puck's:
Lord, what fools these mortals be
-copied from here. And see here.
By "halfling," Hauau means a human-merman hybrid rather than the meanings given in the Wiki article. See link above.
"'Nay, my jo. You hae your ain doom, I hae mine.'" (ibid.)
I first encountered "jo" at primary school in Scotland in a poem by the national poet of Scotland. "...doom..." here means what the Norns have decreed but I don't think that the Wiki article covers this meaning.
The selkie departs and Book Two closes. Next is "Tupilak."