Newfoundlanders speak English, but with a number of different dialects, depending on where they come from in the province. There are 'townies', who you can pretty well understand, and 'bay boys' (pronounced bay bys) who you might not be able to understand. We lived and worked there for two years, and my wife (who taught nursing at the university), developed the ability to discern what outport or bay her students came from. Most of my students were townies, so I never had the pleasure.
We never had any difficulty understanding them or being understood, and it was a great two years. They do have a few unique expressions, though. But that's another story...