Definitions for "Webelos"
"We be loyal scouts" The Cub Scout rank for boys who have completed third grade or who are ten years old. It lasts through fifth grade.
The Cub Scout den for ten year-old boys, that prepares them to become Boy Scouts. It means "We'll be loyal Scouts," and comes from the words Wolf, Bear, Lion, and Scout, the earlier ranks of Cub Scouting.
the program in the last 2 years of Cub Scouting.  Like the word "deer",                                                Webelos is both singular and plural.