What is the game when a man jumps from one plank of ice to another?

The game you're referring to is likely "ice jumping" or "ice plank jumping," where participants leap from one floating piece of ice to another, often seen in polar regions or among adventurous outdoor enthusiasts. This activity can be both thrilling and dangerous, as it requires balance and skill to avoid falling into cold water. It may not be a formal game with rules, but it is sometimes part of ice-related sports or challenges.