As a newcomer to this "electronicspeak", where everything needs to be shortened into a mysterious code, I think LPPs are little plastic people, and LPBs are little plastic b*st*rds or b*gg*rs, although we could just as easily say lightweight posed populous or lovingly painted bipeds. While I did use the form in my reply, I generally disdain the use of such short forms, as it's easy to form one's own erroneous interpretation of such. Even worse, in my opinion, are forced acronyms, where we're expected to ennunciate elided vowels, or 'phone numbers that spell out some cutesy word. Well, that's my rant for the week. Carry on.
Wayne