In the Pitch Perfect movies, Beca creates beats with this key-pad-like device with colorful square buttons that don't have labels. I don't know what to call it and I haven't been able to find anything by searching for it online. Is this a real device? What is it?
The device appears to be called (or is similar to) a Launchpad, and is not just something made for the movie.
They've been around for some time. One was used in a popular YouTube video from 2011 to create a mashup of several songs. This isn't to pinpoint exactly how long devices like this have been around, just to note they were around well before Pitch Perfect 2.
Some additional searching would indicate this could be the actual device being used, a Native Instruments Traktor Kontrol F1 USB DJ Midi Pad Controller. Looks like it could also be referred to as a "drum pad".
A video of the device being used: