Rulings

You can choose to sacrifice a Zombie token to activate the ability. You'll create two tokens that are copies of that token as normal.
If the sacrificed Zombie was itself copying a permanent, the tokens will be copies of whatever it was copying, as modified by that copy effect. The tokens won't copy any other effects that were applying to the sacrificed creature, including effects that changed its types, color, power, or toughness while it was on the battlefield.