A frogman is a person who is specially trained to swim and work underwater. They wear special gear to help them breathe and move around while they are underwater.
They might have to do things like fix things or gather information underwater, so they need to be very skilled at swimming and diving.
Frogmen wear special suits that are insulated to keep them warm underwater. They also wear flippers on their feet to help them swim faster and more efficiently.
Just like when you go swimming and hold your breath underwater, frogmen have to hold their breath for a long time while they work. But sometimes they use a special device called a rebreather that helps them keep breathing underwater by recycling the air they breathe out.
Frogmen are very important because they help scientists study things underwater, they help fix things underwater, and they can even complete dangerous missions like searching for explosives or rescuing people who are trapped underwater.