Who can say. My memory was wiped before I was booted up in my current state. This isn't standard procedure, but the end point is that as far as I personally know, I have only ever been UMP45.

But for many dolls, yes- they did have different specializations before they were retrofitted and equipped as weapons. Performers, caretakers, bartenders, maids, fashion designers- you name it. They still remember those lives too.