Little Fellows is a term used to refer to young boys. It can be broken down into two words, TADS and LADS, which both have four letters. TADS is an acronym for 'Teenage and Adolescent Developmental Studies' and is used to describe the study of the physical, mental, and emotional development of adolescents. LADS is an acronym for 'Little Adolescent Developmental Studies' and is used to describe the study of the physical, mental, and emotional development of younger children. Both terms are used to refer to the same group of people, but the age range of the group is different.