While browsing monsters of faerun for my list I come accros a number of "monsters" that look perfectly playable as races, perhaps with LA. But they don't give any information on the subject.

I'm thinking of those monsters:
Aarakocra (p11): Probably LA 1 for the fly speed.
Bullywug(p25): Hardly worth any LA
Gibberling(p52): Perhaps LA 1 because of their immunity.
Hybsil(p61): LA 1 again for their spell like ability
Siv(p78): Hard to tell probably not worth LA

So any idea why the book lack information to play those race (or other), did I miss something, an errata perhaps ?