...Two? I must be forgetting something fierce, but I recall one of them using a tool, and that was the nunchaku. Which is technically just speculated at being used as a farming implement. I don't really see why it would, a sickle would probably be a lot easier.
Anyway, +1 the crazy weapon making attempt.
The nunchaku were supposedly used for crushing rice and its like. The sai were used in a similar manner to the pitchfork. Or at least that was what I was told.
The drill isn't a weapon, it's a tool.
... Yeah, and two of the Ninja Turtles carry around farm tools to fight with.
Anything is a weapon in the hands of someone who can use it.
A few things to consider.
1. Said farming tools are only weapons because the people who originally wielded them couldn't have actual weapons, because swords were inexplicably illegal.
2. The ninja turtles don't wield farm tools, they wield weapons that--unbeknownst to most fans and most likely the creators, were originally farm tools IRL.
3. Seriously, you're citing TMNT?
4. Overall...improvised weapons are improvised for a reason: They suck compared to normal weapons, and are only used because they have no access to them. We don't have that problem.
I wasn't arguing the effectiveness, just that because something is considered a tool doesn't mean that it isn't a weapon. (In fact now that I think about it, by the loosest definition of what a tool is, all weapons are tools.)
And I'm not citing TMNT. I used it as an (silly) example, not as proof. I briefly considered Jackie Chan and his tendency to use what ever is close at hand to defend himself (as a slightly sillier example) in his movies instead.
Also though I wouldn't knock some silly suggestions, because we never know what might turn out to be a good weapon in the Warrens. We had a laser-firing dagger, so the more silly ideas might become more useful depending on what abilities they get. Somehow I think creativity will pay off in the long run... granted that doesn't necessarily extend to the ridiculous.
I think you just need to quit categorizing everything as either logical or flat-out retarded. We have got plenty of room for middle ground.