Not in great numbers, no. There are not too many rivers in Newfoundland. As opposed even to Labrador, Newfoundland tends to be more of a grilse, which is your smaller strain of fish, rather than multi-sea-winter fish.
There are areas, like the Humber, that have a realm of large fish, and the Gander. But other than that, most of the rivers tend to be your grilse fishery.