Find the team names of the universities whose enrollments are smaller than the average enrollment size.
SELECT t2.team_name FROM university AS t1 JOIN basketball_match AS t2 ON t1.school_id  =  t2.school_id WHERE enrollment  <  (SELECT avg(enrollment) FROM university)
SELECT t2.team_name FROM university AS t1 JOIN basketball_match AS t2 ON t1.school_id  =  t2.school_id WHERE enrollment  <  (SELECT avg(enrollment) FROM university)
[{'Team_Name': 'North Carolina'}, {'Team_Name': 'Duke'}, {'Team_Name': 'Virginia Tech'}]