Here I look at the data sheet. There is no indication about the transistors:https://www.fairchildsemi.com/ds/LM/LM324.pdf
The second page of the data sheet has a very clear schematic that shows the transistors. This amplifier uses bipolar transistors (NPN and PNP) so it is not a CMOS device. Since it is an analog function and not logic, it would be incorrect to say that it is TTL. It is best described as an analog circuit using bipolar transistors.