They come in the two and four pole configurations just like single phase ones as well. The vast majority I have are 1740 and 3450 RPM with only a few 1175 RPM and one 875 RPM three phase.
Depending on what the OP is planning to power a rotary converter unit may be necessary like for a three phase machine or welder or other big device its necessary but for a three phase motor driving a mechanical load its not if the converter box is built right.
Unless he comes back and specifies what he is doing we may never know.