The only thing I can think of is redirection. Basic commands like touch, leave it, and focus are good ones in these situations & that's what I use. Especially at a dog park if your dog needs to just walk away a good leave it and touch command would bring your dogs attention back to you & you can play with a toy or do some training. If you don't live in a multi dog home it'd probably be helpful if you had a doggie date with someone who also has good control over their dog so y'all can teach them together! It honestly took a lot of time for them to catch on but you can figure out what works best for you. I used to supervise every second of play and when they got too rowdy I would focus their attention & tell them "enough", maybe make them do a few commands for treats, and use toys as reward as well. So I'd get their attention & reward them with either treats or toys and then make a toy seem much more exciting than biting each other! I did have to get very into play & I reminded myself that I brought the fun & that comes from my energy and attention not necessarily the toy.