• 05.047 he was so flustered by the egg-question.
• 05.073 than when Bilbo had asked him the egg-question.

This is one of the few times that hyphenating words to create a new one distracts me.  Were there truly so many questions about eggs that Bilbo’s language had a word for that?  Or is it a clue to the nature of the language itself – able to adapt to new concepts by agglutinating when appropriate?

This word does not appear in OED. Wouldn’t that have been surprising?