Frolov represented Russia on two occasions as a junior at the 2000 World Junior U18 Championships in Switzerland and
2001 World Junior Championships in the Czech Republic, where he earned a gold medal. He scored a goal in the 5<unk>4 gold medal game victory over Canada and finished with a team-high six goals and eight points in seven games. He scored a goal in the 5<unk>4 gold medal game victory over Canada and finished with a team-high six goals and eight points in seven games. He scored a goal in the 5<unk>4 gold medal game victory over Canada and finished with a team-high six goals and eight points in seven games.