apart from scent marking and vocal noises Leopards use the white patches on their ears (Ocelli) and tails to communicate with other Leopards.
They communicate by making sounds.
Yes, bu do not house 2 males together because they fight. Also make sure that you have a big enough tank. I house 2 males they did not fight because one was a baby.
Uncia Uncia or Panthera Uncia