"Child"

Building on the previous post, look at the various words for child:

Classical: byis pa,
Literary: phru gu

Lhasa: phu gu (technically this is not a written form but the way it is pronounced) 

Amdo: zha yas (I'm not sure if this is the correct spelling).

There is also khye'u but I'm not sure how to classify it. Probably similar to phru gu.
Are there anymore beyond these?