Froggyblade

Froggyblade is the weapon Strawberry conveniently finds, presumably in Froggyspace to use against Ribbert during their first conflict. It is the only attack anyone is able to land against Ribbert in the fight, cutting his back. Since Ribbert appears to be a master of defending himself with Froggyspace, the sword is implied to negate the frog energy of any opponents in it's path.