Originally credited "Frank Bolle ?".
Artwork identical to the signed "Dry River Rampage" in #3, and also credited by JVJon at Digital Comics Museum. Notice the very thin inklines in many of the faces and on horses in both stories.
In "Frogman Comics" #6 (Hillman) are two stories; "The Floating Mint" and "Frogman's Pacific Jonah", credited to Lorence Bjorklund. The faces and inklines are identical to this story, so the artist must be the same, Lorence Bjorklund. JVJon at Digital Comics Museum credits this story to Bjorklund with "?".