Is the Polly-0 Ricotta, string cheese and mozzarella ok for Passover?
I believe they have an OU.
In regards to Pesach they are Kosher for Pesach for all
Is vinegar a potential chametz or kitniös concern?
Not a problem
I guess if the vinegar is made from corn, since it’s derivative and not actual corn, R’ Abadi and some others are lenient?
Kitniyot less than 50% is ok for all unless there’s actual peices of kitniyot.