The combination of topological insulators with ferroelectric properties allows to influence band structure of the surface states. This work inquires into Raman spectroscopy of ferroelectric phase transitions of chalcogenide compounds (SnTe, SnGeTe, PbGeTe, PbSnTe, and PbSnSe). By cooling below the critical temperature, crystal structure of these compounds changes from the rock-salt, i.e. two interpenetrating FCC lattices, to rhombohedral, and the compounds become Raman active. The Raman spectra were measured in the range from 300 K to 75 K, and by cooling below the critical temperature new phonons appeared in the spectra as well as phonons with temperature-dependent Raman shift.