The first one is just a baby few-spot appaloosa. I actually read about the thing that causes that zebra's stripes just a few weeks ago, but I do not remember what it was called. If I recall it is SIMILAR to albino, but not. Extremely rare, as animals with that gene/mutation/whatever rarely survive in the wild. They stand out too much.
Third is called a Badger Face, some people also call it a 'reverse blaze.'
Fourth is just a splash horse, but going by those jagged edges on the white I wouldn't be surprised if he/she had sabino also.
And the third one is a chimera. Chimerism can be expressed in different ways. It is believed that if the two fetuses merged earlier that the resulting chimera would more likely be brindle. However, in the event that they merged later it is thought that it appears like this, with the two different colors more 'patchy', I suppose would be the word.