Yes some can talk, although a very limited volcabulary and very birdish sounding. Budges can talk also, actually some have been marvelled at knowing over a thous words. I think thats rare though..but not impossible.If you keep two in a cage together though they will prefer to learn thier own language and bond more with thier cagemate than you.
Its not like I need to add this, but any bird can talk, at least captive ones, not sure about Parrotlets, but I'm sure its out there. Some can talk very clear and speak what their owners have taught them and others only say their name. Even starlings can talk, so I'm sure any bird has the capability of doing so. Oh, I never heard a finch speak either, so don't get fresh ;).