I have named all sorts of peaks I haven't climbed. But they were unnamed at the time to the best of my knowledge. Other people with better claims can petition me to change them or just beat me up and leave me bleeding in a ditch if they disapprove.
I don't think all mountain names have to be inspiring, or positive. Or else we wouldn't have Mt Terror, or Mt Despair. I don't see anything wrong with Mesachie on those grounds. I think some of the originally proposed names, particularly "Holyoke" are much less inspired.
As for a mountain looking evil, wicked, Devilish... - maybe it is just that it killed 2 friends but I think the NW face of Devils Thumb looks evil. But inspiring nonetheless. Hopefully just inspiring in the abstract....
Isn't it funny - Fred complains about Twin Spires being renamed "Twin", Mox in Chinook, yet he renames stuff himself in Chinook?
As for the chinook jargon itself - it's an interesting and amusing polyglot language. Speaking it, English, and one or two Native tongues (your own and your neighbours) was no uncommon feat in the 1800's. It has a claim of some standing to be the first "official" language of the PNW. So - I don't see anything wrong with naming peaks in it. I doubt that Chinook names are appropriate only in Chinook Nation territory. I don't think the jargon owes anything much but the name to the Chinook Nation. It's more like the Chinook wind or the Chinook salmon found most places west of the Rockies.
Ray is using a double entendre with the Turtlehead Mountain name. The other meaning of "Turtlehead" relates to an incipient defecation, if I may be so bold. "The turtle is ready to stick his head out of the shell..."
Those are my somewhat unconnected thoughts. On with the boxing gloves!