[1] Isak Frey gained his initial international exposure in January 2020 as a member of the Norwegian team at the Youth Olympic Games.

After a hiatus from international competitions, he made his debut in 2022 at the Youth World Championships in Soldier Hollow, Utah, where he, along with Stian Fedreheim and Andreas Aas, emerged victorious in the relay event.

Additionally, in the mixed relay, Frey, partnering with Endre Strømsheim, Juni Arnekleiv, and Maren Kirkeeide, secured victory after leading the team as the starting athlete.

In March of the same year, Frey participated in the Junior World Championships, clinching bronze in both the mixed relay and individual events.

Representing Oslo og Akershus, he, along with Strømsheim, Johannes Dale-Skjevdal, and Sturla Holm Lægreid, became the Norwegian champion in the men's relay.