I wouldn't try a
bath until they are comfortable with their new home and with handling. The
bath isn't really necessary unless they get soiled and need to be cleaned up. Some dragons love baths and others hate them. Once you do try a
bath, watch for behavior that shows signs of panic or distress that would indicate they don't like the
bath. If that's the case, it's not worth the stress and I would limit baths to only when really necessary due to soiled skin/bad smell. If they seem to enjoy the
bath and splash around and swim (they are generally very good swimmers) then offer as many baths as you'd like. It really varies between dragons on that one.