These are not quolls but they are dasyurids. This is a pair of Tasmanian devils. The larger one with the teeth is called Monty. He was making awesome piss-off noises at the smaller devil.
Welcome to Tasmania.
These are not quolls, though they are the closest existing thing to a quoll there is which isn’t actually a quoll. They are Tasmanian devils. Tasmanian devils currently face serious threats to their species survival in the form of devil facial tumour disease, a communicable cancer. For more information on what you can do to assist in their conservation, see Save The Tasmanian Devil.