Can't check on 11.4, but can check on 11.3 and there is no sign of any avg program, neither installed nor available for installation (although it could be hiding away in some minor or unofficial repo that I don't have set up).
As far as I can
see, it isn't available for 11.4, either.
What you can do, if you think that it might have pulled in as a dependency, is go into the Yast to the install/remove software section and see if anything depends on any of the AVG names that you have seen. I suspect that there won't be, but you should have a look. It would also be interesting to see what 'technical information' you can see on any of those programs, if any, and from which repo the programs have been supplied from, given that the software search doesn't show it up.
It is possible that the programs were not installed via the package manager, which will limit the amount of information that you'll get, but it is worth having a look.
Also, just for general info, it would be interesting to know whether you always use the package installer, whether that be Yast or Zypper, or whether you have been installing software from tarballs, etc.