The frog-mouth helm (or Stechhelm meaning stinging helmet in German ) was a type of great helm, appearing from around 1400 and lasting into the first quarter of the 16th century. The helmet was primarily was used by mounted knights for tournaments rather than on the battlefield.
The frog-mouth analogy was drawn from the way the ocularium of the helmet (the slit through which the wearer could see) had the appearance the open mouth of a frog. During jousting tournaments, the helmet offered a better degree of protection from lances that had splintered on impact with body armour. Early examples of the helmet were a made from a single piece of metal, while later dated helmets had hinged constructions that could be disassembled.
Appearing in the 15th and 16th century in Germany, the helmet became popular for jousting due to the improved protection of the eyes it offered. Early one-piece examples were later improved with hinged varieties. In the late 15th century, it became customary for the helmet to be mounted with screws onto the wearer's cuirass, though this only allowed the wearer to look forward.
Later versions had hinges and could be opened in the front for ventilation, while also "folding" around the wearer's head to put on and "unfolding" to be removed. The helm had vents allowing the wearer to breathe more easily whilst using it, as well as allowing non-muted noise to enter into the helm. Underneath the helm, the wearer traditionally had a leather cowl to protect from concussive impacts. The cowl was attached with leather straps and cords fastened to the helmet, so that a certain degree of head movement was guaranteed. A popular jousting technique was, at the last minute, to pull the head up. This completely obscured the vision for the wearer, but it protected the eyes from the splinters of the lance as it broke on his armour.
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