Most common mints for humans are ok like peppermint, spearmint and pineapple mint. Just don't overload them with it. Two to avoid are catnip and catmint because they
are toxic to gliders.
Onions, chives, garlic are also toxic to gliders.
I usually give mine parsley, basil & mint now n then, my girl loves fresh leafy things as well as fresh flowers. She shows no shame when I give her a squash blossom or hibiscus flowers lol she buries her whole head in the flowers. My male doesn't care for them much yet I don't think he quite knows what to do with them lol