First of all don´t connect them as you said, if the wiring is what you are thinking magnetic fields generated from 1-2 trunk will be opposite to 2-3 trunk, (that means ZERO reactance for both = short circuit)
dou you know wether they got a permanent magnet? ( they would not spin freely and u can check check it by connecting a multimeter or LED on some wires and moving the shaft a bit)
You could tell what were those motor for if you happen to know. Are they small? , are they as washing machines motors? different internal wirings should be not for three phase arquitecture but for different speed or voltage configurations.
You can connect a commonplace three phase motor (there are not two phase) using only one phase, you´ll have to start it by pour own hand (only safe if there is nothing attached to the shaft, otherwise don´t do it)) , the rest of power should appear on the remaining (autogenerated) wires to test the remaining motors, that an only be made as a test and you should check using a 0.25 amper fuse, (or a series 100w lamp if they are small)