interesting thing with skilpadde. it's like the English shield and paddle, which resemble two of the major parts of a turtle, the shell and the legs.
'padde' actually means 'toad', but the 'shield'-part is right.
How do you tell the difference between a feminine and masculine word in Norwegian? Duolingo doesn't mention anything about that.
And here begins and interesting story between a crab and a turtle, 2 best friends in a water puddle.