Uechi-ryu karate, which is essentially a Southern kung fu style, uses the knuckles of the toes in its front kick. That is, the toes are curled down and the kick hits with the bent joints on the top of the toes. Some kung fu styles kick with the ends (tips) of the toes. Most karate styles however use the ball of the foot for the front kick (as well as the heel, which tends to be slightly more emphasized in Okinawan systems). Isshin-ryu and other systems also have a "fish kick" that uses the top of the foot to strike the groin; in one version the toes are pointed up (as for a ball of the foot front kick) after impact and used to rake back across the groin after the initial hit as the foot is retracted. The fish kick however is not the principal front kick of the system, whereas the Uechi toe-knuckle kick is.
Are there are any other karate styles that front kick with something other than the ball and/or heel of the foot?
Are there are any other karate styles that front kick with something other than the ball and/or heel of the foot?