Are Canvas admins able to view a log which indicates the specific user who deleted content?
I don't think there's a log to allow you to do this easily.
If you know roughly when the content was deleted and who all had permissions to do it, you can review the Page Views for each of the users (How do I view the page views for a user in an account? ) to get an idea of whether they may have been active in the course at the time, but Page Views only reflect some activities, and Deletes do not seem to be one of them.
If your school has the Canvas Data Portal enabled, the "requests" data may give more details on course activities, but I haven't delved into that yet.
Thank you, Michael Zimmerman.
Retrieving data ...