Query Log - removing specific devices or grouping

No. There are some web GUI settings where you can exclude domains or clients from the top lists, but all queries are logged if your privacy settings allow logging.

One workaround - if these requests come from a client that supports a hosts file, map the domains to 0.0.0.0 on that client using the client hosts file, and the requests will never leave the client and won't appear on your Pi-Hole. I do this with several Windows domains that I want to block.