Final answer:
Aragog's wife is called Mosag - True
Step-by-step explanation:
The statement that Aragog's wife is called Mosag is true.
In the book Harry Potter and the Chamber of Secrets, it is revealed that Aragog's wife is indeed called Mosag. Mosag is a female Acromantula, and she plays a significant role in the story. Aragog and Mosag have a large family of Acromantulas in the Forbidden Forest at Hogwarts.