Tusken Raider is misspelled as Tuskan Raider.
In Chapter 2: The Child (2019), it was made clear that the Mandalorian does not speak the language of the Jawas nor understand it very well. However in Chapter 5 he is fluent in the hereto unknown sign language of the Tusken Raiders, despite the fact that the Tuskens are not known for having much contact with anyone outside their tribes, certainly not as much as the Jawas.