One who eats two meals before lunch wouldn't called both of them breakfast. You only break that 8-hour (hopefully) fast once a day.
In my first language, Croatian, there are two words for meals before lunch:
1. "zajutrak" - meaning "for morning", compare Swiss "Zmorgen"
2, "doručak" - meaning "until lunch"
Most Croatians do not eat both of those breakfasts in a day. Many do not even eat one, only have 4 coffees and 12 cigarettes before lunch.
Forgive me for not being a Tolkien fan, I have to ask, are Hobbits translating words from their language into human language (English)? Is that why they call both "breakfast"?
@lwriemen Yeah, every meal is a breakfast in that sense.