(And I dunno about the mage thing... Heck, do we even know Reynir believes in magic?)
Iceland has an official
academy teaching that stuff, he'ld need to be pretty clueless about his own nation to dismiss the entire concept.
(For all we know, some of his siblings going places and killing interesting stuff might
be mages. The Dagrenning guys would be outright stupid to not welcome mages as donors, and we've seen too many instances of "magic's running in this family" for it not to be at least
partly hereditary.)
some people have more, ahem, practical uses for [blorptroll], and some people just want to kick it down the stair for making all that noise. The other trolls will be happy to see it go, anyhow
My mind keeps coming up with the German term
Fußhupe whenever it's mentioned.
(= "foot(-operated) klaxon", originally an actual car part, but since the horn's operated by hand nowadays, it has been reassigned to small dogs.)