I somehow had the impression that it can’t or that it does not, whatever. But not from my own beliefs, more from what I heard from other people, but I never bothered about that.
Actually I never heard anyone claim that it can do just that, but for me it was kind of a normal thing. But recently I was checking a site in Google Webmasters Tools, and it had some problems with certain links while crawling. The links were of the type somepage.php?something=that Where I had no idea who would have linked to that since that was available from a dropdown in a form which actually not even had a button but was submitted via onchange=”this.form.submit();”. (which could also mean that Google does know to read and execute javascript, but that’s I’m going to explain in one other post) Anyway, I searched for back links to the site containing that parameters, and found it. So I first thought it’s just a coincidence, and I solved the problem by redirecting the call back to the original page when the new information was saved in the session data. But this fix triggered the same problem on some other page which before that had no error reports, and this page is surely not receiving much visitor traffic, so I really Doubt that someone did post a link to that one in the meantime.
Conclusion, yes it knows and does follow forms, at least it seems so 
