The official Dragon Ball website’s fourteenth entry in “The Nearly Complete Works of Akira Toriyama” — an on-going series highlighting rare and important pieces of the author’s work over the years — is a four-panel comic drawn for the 1984 #5-6 issue of Weekly Shōnen Jump, released 05 January 1984. The #5-6 issue contained four-panel comics by several different artists. The issue also contained chapter 202 of Dr. Slump from Toriyama.
The website’s listing incorrectly identifies this as the 1984 #6 issue (no such issue exists; the 1984 #1-2 and #5-6 issues were combined, double-issues). Furthermore, the site lists the 23 January 1984 issue date from the front cover as its release date, as opposed to its actual (correct) publication date of 05 January 1984.
In the comic, Momotarō is traveling to Ogre Island to drive out the monsters. He asks a dog to come along with him, and if it does, he will give him a dumpling. When the dog does not answer, he repeats his demand more forcefully, until the dog starts growling and barking at him. A passerby wonders what this kid is doing, talking to a dog (Momotarō befriends a talking dog in the original tale).
“Momotarō, Best in Japan”
Narration: Momotarō goes to Ogre Island to vanquish the ogres.
Momotarō: “Hey! A dog.”
Momotarō: “If you come with me to Ogre Island, I’ll give you this dumpling. How about it?”
Momotarō: “Well, how about it? This sure is tasty. Will you come with me? Huh?”
Dog: *pant* *pant*
Momotarō: “Hey you, if you want this, then say so!!! Hey!!”
Dog: *growl* *bark* *bark*
Bystander: “What are you talking to that dog for?”
While not present in the original manga, Dragon Ball episode 123’s scene of Piccolo being found in an egg by an elderly couple is itself a clear reference to the original Momotarō story.