Thankfully they got shrunk down for the films...much better
It's called Minionese and is a really high-pitched combination of different human languages. There's some Russian, Chinese, Japanese and Korean in it. Plus lots of "banana".
Despite there being hundreds and hundreds of Minions, there can only be 48 different combinations of Minion bodies. So that means a lot of Minions look exactly the same!
Oh and the Oompah Loompahs from Willy Wonka!
Purple is the opposite colour to yellow on the colour spectrum. The good and evil Minions are literally opposites!
That doesn't seem to bother them though!
This is a fact. Look how how happy this guy is!