Sure they will be able to reproduce, would have got lessons from Fisto.
If they knew how to build more of themselves and had the abilities too create the parts needed to do so (or steal them from the Institute), than it's possible.
But I highly doubt that they would be programmed with such information. Of course, that doesn't mean they didn't learn how to do it while serving inside the Institute. But the biggest hurdle will be manufacturing the necessary parts.
Provided they have the means to do so it wouldn't be out of the question. I'd like to think that there's probably someone in the institute who's sympathetic to the androids/synths and helps them escape while also providing some resources to the ones who have gotten out.
I don't think they were programmed to replicate. Atleast not yet...
*zips up Fisto in a kinky outfit*
"Synthetic life finds a way."
- Synthetic http://www.imdb.com/character/ch0002031/?ref_=nm_flmg_act_44
Someone do a 50's style educational video "When 2 synths love each other..."