lammikko returned to the frontenacs for the 2015–16 season, and in 59 games, he scored 22 goals and 55 points. on 15 february, lammikko earned his first career hat-trick, scoring three goals against mackenzie blackwood of the barrie colts in a 6-4 victory, and on 18 march, lammikko scored two goals and added two assists for four points in a 7-0 win over the oshawa generals. in the post-season, lammikko scored three goals and seven points in nine games.