Trpimir II was an alleged King of Croatia from 928 to 935.
[1] He was presumably from the Trpimirović dynasty, however, he's not mentioned in historical sources, being a historiographical invention.
[2][3][4] In the old chronology (per Ferdo Šišić), Trpimir II would be the son of Duke Muncimir and younger brother of King Tomislav.
[5] De Administrando Imperio mentions that in the time of Terpimer (whose identity is disputed to be Trpimir I from the 9th century, or Trpimir II), the Duchy or Kingdom of Croatia had a significant merchant fleet that traded across the entire Adriatic Sea.
The mentioned Terpimer was succeded by his son Krešimir I.