Fan spawn-able zombies and potted plants!
Barfer - Eats brown coat zombies (including protected one, shielded one are difficult for them) and barfs acid on them special: loses health every time it vomits. their vomits acts like goop, but it doesn't slow them down.
Zombi-shroom - once a zombie munches on these guys, they become hypnotized and starts attacking other zombies and zombie players. special: cures hypnotized plants by sending pollen to them and regrows shrooms when healed. super rare ability: if planted against a wall and if the player is lucky enough, the plant will move out of its pot due to be using an over sized ant then climb up a wall and perched up there for a while until zombies starts to approach.
Gas zombies - runs in to any plant and explodes in a life draining fart that paralyzes plants in their tracks.
hypno zombie - much like the zombi-shroom, but quite more different. if came encounter with a player plant, the effect is similar to the engineer's sonic grenade, if potted plant, just hypnotized.