- His father was a lawyer in Hønefoss; he emigrated to the United States in 1904 and was not heard from after that.
- His mother was an actress and the sister of the actress Ragna Wettergreen. His sister Ruth Frogg (1897-?) was also an actress.
- Together with Alfred Maurstad, he wrote the adventure comedy Askeladden, which was performed at both the National Theater in Oslo and the National Theater in Bergen in 1930.
- In 1921, He and Johan Borgen approached Halfdan Christensen, who was manager at the National Theater in Oslo, to be employed as actors in the ensemble. Frogg made a positive impression, and he debuted in the role of the priest's son Benedikt in Nini Roll Anker's Kirken in the spring of 1921, while Borgen went on to study law.
- Frogg married Elizabeth (Else) Thaulow (1903-1968) in 1926. They were the parents of the sculptress and Morgenbladet journalist Lise Frogg (1929-1958), who married the Danish architect Ulf Vejlby.
- Back at the National Theater in Oslo, he had the lead role as Dominique in Domino, together with Gerd Egede-Nissen. After the 27th performance, he died after falling from the veranda of his apartment on the eighth floor of a dormitory building at Frogner plass. He was dead when he arrived at the hospital. He left behind a slip of paper with the inscription G.E.N.I., which may have stood for Gerd Egede-Nissen Ingebrigtsen.
- He played the title role as Ambrosius Stub in the Central Theater's production of Ambrosius by Christian Molbech, and as the young writer Falk in Ibsen's Love's Comedy at the National Theater in Bergenn, before he returned to the National Theater in 1928, playing major roles in classical and modern plays.
- From 1930 to 1933, Frogg was engaged at the Oslo New Theater, where he performed demanding roles, including the title role in Marius in 1931, a play by the French writer Marcel Pagnol. The following year, the theater staged Pagnol's Fanny, again with Frogg in the role of Marius.
- Frogg attended Frogner School, where his classmates included Johan Borgen.
- Frogg confirmed his lyrical talent as the young priest Peter in Henrik Ibsen's drama The Pretenders at the National Theater in Oslo.
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