Translation of frogman in Spanish

We drove to the airport to do early check-in but it went so quickly that we had four hours left before our flight departed. We therefore took a cab back into town and visited the local market.
After ten minutes and after drinking a bottle of water we returned to our place. It was already three in the morning. We were unhappy to miss a great party, but our physical conditions were bad.
We first took a regular bus to the border, which was basically just an empty building. There we switched to Jeeps, as the terrain was rocky. In our group there were 4 American girls and us.