Yes, apparently there is such a thing as a leghook submission. Although leghooks are usually used to secure a pin, they may also be used in a more aggressive manner to achieve a submission. The leghook submission hold is a much more aggressive form of the leghook, and it takes up a lot more energy on the part of the attacker.

With the defender/victim on her back, the attacker hooks one of her legs by reaching around the back of her neck with one arm, hooking the leg with the other and then connecting the two hands. In the same time, the attacker scissors the victim’s other leg. When the hold is fully secured, she begins to straighten her body, by pulling upward with her arms and pushing downward with her thighs. This way, the victim will be subjected to pressure on multiple fronts. Firstly, her neck will be pulled forth painfully. Secondly, her two thighs will be split and pulled apart in the hold. All this happens while she’s completely helpless and immobilized.

Possible escape: If the victim happens to be extremely flexible, she may be able to ride the hold out without submission. She’ll still be immobilized though, so she won’t be off the hook. The only way for her to escape really is to power her way out of it.

Efficiency: The efficiency of this hold depends on the strength (upper and lower body) of the attacker. If she’s strong enough, the leghook submission hold can be a truly devastating one.