I've not tried mango on my piggies but I do remember a few years ago when I had my rats and was living with my ex, he won a huge fruit basket packed with exotic fruits.
After checking they were ok for them to tackle guess who ate most of it? Yep, the ratties! And mango was a real favourite! I love ratties but they can be less gentle than pigs and they pounce on your finger instead of the food sometimes LOL!