Chaosmancer
Legend
I edited my post, there are actually 3, or 4 if you count Nimsy's named child Scoop - more with her other kids. Are they "significant" - depends what you mean - she is the Mayor of a small town. She gives out a quest and bakes halfling shaped cookies. There are certainly a lot more halflings than there are elves. If there are any elves in the Ten Towns they keep a very low profile. Rinaldo is also involved with a quest, and Perilou indicates the presence of halflings amongst the adventuring population.
How do you know they are halfling shaped cookies?