Young Robin Hood started in Boy Comics #3 and ran through #32. It featured a band of crime fighting kids who patterned themselves after Robin Hood and his Merry Men. Instead of Sherwood Forest, they operated out of a secret treehouse hidden in Central Park.
Swoop Storm started in Boy Comics #3 and ran through #32. It featured the adventures of Swoop Smith, a 10-year-old boy who is also a crack pilot. He uses his amazing flying abilities to battle evil.
The adventures of George "Yankee" Longago started in Boy Comics #3 and ran through #28. Similar to Little Nemo in Slumberland, Yankee Longago would fall asleep only to wake up in another time period, where he'd have weird adventures courtesy of writer and artist Dick Briefer. He would then wake up to find himself back home, unsure if it was real or dream.
Pepper Casey was a boy boxer. Sad to say, his feature only lasted one single issue - Boy Comics #3.
Bombshell, Son of War, began in Boy Comics #3 and ran through #7. Bombshell, whose real name was Dryas, was the son of Mars, the Roman god of war, who also happened to be the king of the planet Mars. Like God, he sent his son to Earth to save mankind, only in this case, the son was armed with a magic sword and tasked with killing all the Nazis he could find.
Rabbit Foote began in Boy Comics #4 and ran until #5. Rabbit Foote was the luckiest boy alive, though apparently not the most interesting given how short his series was.
Little Dynamite began in Boy Comics #6 and ran through #39. Little Dynamite was the nickname for one Rollo P. Quinn, a pugnacious kid who ran a streetwise gang and wore a bowler hat. What can I say, stories about kid gangs were very popular in the 1940's.
Dilly Duncan at Dorset High began in Boy Comics #57 and ran through #71. The feature then moved over to Daredevil, where it ran from #81-134. Dilly Duncan was basically Charles Biro's version of the Archie Comics gang, only not remotely as interesting or funny.
Rocky X began in Boy Comics #80 and ran through #118. In the first half of the series, Rocky X was a futuristic astronaut battling alien menaces. In the second half, he somehow became an American soldier battling the Red Menace in Asia. There's some serious rebranding for you.
Sniffer and Iron Jaw began under the title The Deadly Dozen in #87 and ran through #118. Sniffer was the comical leader of a band of inept crooks called the Deadly Dozen. Along with Iron Jaw, they guest starred in the Crimebuster stories in #80-83 and #84-86 before jumping to their own feature. The Deadly Dozen frequently sparred with and/or teamed up with Crimebuster's archenemy, Iron Jaw, who became more and more ineffectual as time went on. Sniffer previously had his own feature in Daredevil #5-69, so this was basically a straight up swap for Dilly Duncan. Which in my book is a lose-lose proposition.