I don't know why I didn't think of doing so earlier, but I checked the Markstein Toonopedia. And there it was: Peter Pat, a United Features Syndicate newspaper series. Here are the highlights:
"On Sunday, June 3, 1934, a winged warrior [carried the boy Pat] from the mountaintop where he was standing to Pagoland, a magical place that offered enormous scope for adventure...The protagonist was always called "Pat" in the written part of the story...the text was placed in captions under each panel, like that in Prince Valiant...
Mo Leff...was the cartoonist behind Peter Pat....Pat wasn't a hot property, licensed out for radio shows, movie serials or even Big Little Books. But reprints of his Sunday pages did get into comic books like Tip Top and Sparkler...he even got a cover and a logo of his own in the 8th issue (1939) of Single Series...his comic [strip] lasted only a little more than a year [June 3, 1934 to July 28, 1935]"
In his "Stripper's Guide" blog Alan Holz notes that some of the PP Sundays were translated into French and reprinted by Hachette in 1937. Leff, of course, went on to ghost Joe Palooka for many years, finally winning a byline after the death of creator Ham Fisher.