I've seen people arrive in Zimbabwe with hunting firearms. Those iirc require a licence, so I'm not sure that's relevant. But I do think this might be:
IATA - Zimbabwe Customs, Currency & Airport Tax regulations details
http://www.iatatravelcentre.com/ZW-Z...airport-tax-re...
Zimbabwe Customs, Currency & Airport Tax regulations details ... drugs; honey; indecent or obscene literature; toy firearms;
flick and lockable blade knives.
See:
http://www.zimra.co.zw/index.php?opt...d=22&Itemid=27
From that, the throwers are OK; the lock blades not.