Froholdt started his football career in Vallensbæk IF, and in 2018 moved to F.C.
[2][3] Here he worked his way up through the club's youth academy, and in January 2023 was rewarded for his good performance with a contract until the end of 2025.
[4] Froholdt made his debut for Copenhagen's first team on September 27, 2023, in a Danish Cup match against IF Lyseng, where he was substituted in the 57th minute in Copenhagen's 9–0 victory.
[6][7] He finished his debut season with 8 appearances for Copenhagen's first team.
On July 23, 2024, 18-year-old Froholdt was rewarded with a new contract until the summer of 2028 and was also promoted to the first team squad.