The main difference between ponds and lakes that you can notice in satellite view is depth. Lakes are deeper, and generally (but not always) bigger. Lakes because they are deeper have little vegetation and the shores are rocky while ponds have lots of vegetation and the shoreline will have a greater percentage of grass and vegetation on it. There is a large number of ponds that could be called lakes or vice versa. I wouldn’t worry too much about it and usually will go with the actual name from the Newfoundland and Labrador Geographical Names Board by the Department of Environment & Conservation. Wetland info can be found here http://www.ducks.ca/learn-about-wetlands/what-wetland/