When it comes to the sentence "Barnen vill ha flera bullar" I would immediately assume that you're talking about "several" buns. It is better to keep them apart and learn that

"fler" - "more" & "flera" - "several"

"Fler" really sounds a lot better than "flera" when talking about "more"...

Hey, you might find this helpful: Fler and flera can both be used when you are comparing something, for example: det kom fler/flera elever till lektionen idag än igår Or when it is used in a context where the swedish world: ytterligare can be used, for example: Nu finns det fler/flera människor som är emot den nya presidenten. HOWEVER! If you use it in a way it can mean ''more'' it is always flera. Viktoria äter flera bullar om dagen, eller, det finns flera drömmar ( a type of cookie) i kakburken.

fler for countable things and mer for uncountable or mass nouns. Sometimes both work for the same noun, but then they mirror how you think of the thing in question, like here – it's possible to view bullar more as a mass noun, so mer is also accepted.

Sure, adding that now.

Some Swedish rolls are called frukostbullar, in case you're hungry. https://goo.gl/Hw6yRc
It looks like rolls or bread-rolls are accurate translations. I say it can't be a coincidence that the Swedish word for roll (like wheels or rolling out dough) is rullar which looks like bullar (hmmm which in turn shares a suspicious start with bun). This link had lots of languages' names for rolls:
https://en.m.wikipedia.org/wiki/Bread_roll
https://en.m.wikipedia.org/wiki/Bun

In southern Sweden, "bullar" is used for "rolls" as well, otherwise "frallor (sg en fralla)".

We unfortunately do not have any control over the voice recognition software.