We see two more up on a platform, and then there was the boss, the guy by the attack toad, and the attack toad. Then two more in the tower. Plus any reinforcements that they can summon from nearby. So at least six, plus the Attack Toad, and the Boss.
Like a really unsubtle chain sickle. The great thing about a chain sickle is that you can swing the weighted chain with both hands without letting go of the sickle portion. The design allows for a lot of flexibility during a fight, although Ox's version wouldn't be used like a normal chain sickle.
getting exciting!
http://marblegate.thecomicseries.com/comics/136/