Those appear to be backup tables of some sort. Take a look in the site's wp-config.php for the $table_prefix. It should look like this:
$table_prefix = 'wp_';
If so, and there are no other WordPress sites using the same database, then it's safe to delete those tables. I would make a complete database backup before you delete anything, just in case they're needed for something we did not consider.
You'll have to figure out what is creating those tables. Maybe there is a plugin installed or a backup job running on the server?