Grammatical Anomaly - 'oaves'

Vis a vis my previous post - is 'oaves' the plural of 'oaf'*?  And if not, why not?  'Loaves' is the plural of 'loaf', after all.
It's an anomlay anomaly and I think someone should be Doing Something About It.  Not me, obviously.

*of course it isn't. I know that.  I'm not stupid**.

**actually, I am quite stupid in some ways.  And even stupider in others.