Issues #5 and #6 have an indicia title of "Thun'da."
Film rights to Thun'da were sold for movie production with the character eventually appearing in the serial 'King Of The Congo' in 1952, starring Buster Crabbe (information from Wikipedia [https://en.wikipedia.org/wiki/Thun%27da], Darkworlds Quarterly [https://darkworldsquarterly.gwthomas.org/thunda-king-of-the-congo/], and from Dennis Durrant via the error list, November 2006). A known movie poster of the serial contains the note "Based on Adventures of the Dynamic Hero of 'Thunda' Cartoon Magazine" (from Patrick Hilger, June 5, 2023).