Change Label of custom post type

The list_table_primary_column hook might be the one to go with, i.e:

add_filter('list_table_primary_column', 'teams_table_primary_column', 10, 2);

function teams_table_primary_column($colname, $screen_id) {
    if($screen_id == 'teams' && $colname == 'Title') {
        return "New column name";
    }
}

Note: this is completely untested, let me know how it goes!

Reference