While there isn't a specific character named "Knuckle Pine Turbo Boxing," the term likely refers to the found in Knuckle Pine's versions of characters like:
Knuckle Pine: Turbo Boxing DL isn’t for everyone. If you hate trial-and-error reflexes or roguelite repetition, you’ll bounce off like a limp jab. But if you crave a high-skill, high-reward arcade fighter with a bizarre wooden hero and endless room for improvement, this is a hidden gem. It’s Mike Tyson’s Punch-Out on a caffeine drip, with a splintered heart. knuckle pine turbo boxing dl