Hen or Roo

We have 5.5 week old chickens. One is a Wyandotte the other is a jubilee Orpington. My suspicion is they are both roosters. They are constantly fighting when together. The Wyandotte has crowed three times in the last two weeks. They pick fights with all the other chickens. Can anyone give advice if these are roosters or hens? I have a farm that will take them
If they are roosters.