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We have changed names even without having a replacement from Tolkien for the reason that their Sindarin was outdated. In this case we have a replacment and even so it only appears once when we deailing with a late change that is so much to be wondered. Even if Tolkien used the name 'Bauglir' at a later occasion (which is not sure) we have precedents of such backward and forward changes before he was used to the changed form.
In short: I think 'Baugron' is to be taken.
I have looked up all occassions were 'Bauglir is used in our text adn the change would not creat any problem in rhyming couples (in aliteration both seem near enough to be exchangeable any way, but Bauglir was never used in that either in our text).
Respectfully
Findegil
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