The cover is a signed Zolnerowich image reprinted from the cover of Jungle Comics #18 with Kaänga's head redrawn by Moreira and Zolne's signature removed.
The story title is taken from the cover blurb.
Frank Riddell is a by-line used at Fiction House and does not reflect the name of an actual person that we know of.
Traditionally the inks have been credited to Moreira, but according to Robert Barrett, Reed Crandall indicated to him that these were his own inks. This fact gives added depth to the talent that was Reed Crandall.
Crandall art credits confirmed in Alter Ego #129 (November, 2014) by Alberto Bacattini.