I don't know about freezing fleshy things like elephant garlic, then hoping they'll grow.....my instinct is that freezing them would destroy them. Maybe someone else knows for sure? If they are anything like the elephant garlics I have kept back for eating, they keep well anyway, much better than ordinary garlic.
Why not devote yourself to eating them??? Store some in a dry airy place for later planting, and use the rest underneath roasts for making gravy, mashed into potatoes, liquidised into soups, roasted with potatoes and onions and peppers, everything you can think of. Two hundred (cloves not whole heads???) is a lot - I wish mine would bulk up as much as that, but I can't resist eating them.