Ships that pick up cargo from any port and travels anytime are called

Explanation

Tramp ships, also known as tramp steamers, are cargo vessels that do not have fixed schedules or routes. They operate o an "as-needed" basis, picking up cargo from any port where there is a demand and traveling at any time as required. Tramp ships are flexible in terms of their destinations and timing, allowing them to transport cargo to various locations based on market conditions and specific shipping requirements.