I currently soak my potato crisps in the freezer to remove excess starch. If I buy a blanching machine will I no longer need to soak them in water in a freezer?

No need to soak potatoes in a freezer. If anything this will do them more harm than good. Soak, rinse, and repeat several times to remove any undesired starch. Once blanched potatoes need no further soaking, simply keep lightly covered until ready to finish fry.