Having previously represented his country at under-18 'club' and under-19 level, Frawley was selected for the Ireland U-20s ahead of the 2017 Six Nations Under 20s Championship. He featured in all five games as Ireland finished fourth. Frawley was also part of the Irish team which finished ninth in the 2017 World Rugby Under 20 Championship, playing all five games and scoring a try versus Samoa.