multiple frequency count

Can arduino measure 2 frequency at the same time, I'd like to work with pro mini or nano? Or do I have to look somewhere else like teensy?

Thank you.

Are the frequencies you wish to measure from 2 different sources, or are they superimposed on the same source? If these are from 2 different sources, and say in the low kHz range, you should be able to do that with ease on any Arduino. If however, these frequencies are on the same source, you have a problem of demodulating them, and that may not be so easy.