Astroboy Manga, vol 1:
"New readers may at first also find Tezuka's visual gags confusing. He created so many stories in his lifetime that he developed a type of dialog with his readers, and he loved to insert nonsensical characters at random into scenes that seemed to be getting too serious. Thus a gourd-like character would sometimes come sailing out of the air and bounce off the floor, or an odd, cartoony little creature would come out and say 'omukae de gonsu' (roughly, 'Here ta meet ya'

."
Astroboy Manga, vol 10:
"Next we've got this fella... He's called Hyotantsugi in Japanese, 'n he's a silly kinda gourd or fungus stuck all over the place who sometimes emits a stinky gas, yup."
These are all the occurances of Hyotantsugi I could find in the 80s series of Astroboy. Most of them are very hard to spot and are only on the screen for a few frames.

Uran dances with Hyotantsugi in Uran Falls In Love.

The shop owner in Outer Spaceport R45 tries to sell Astro some moon rocks. One of them is a Hyotantsugi.

Astro kicks the pile of tribesmen off him in Lilly On Peligro Island. One of them is a Hyotantsugi.

The totem pole in Lilly On Peligro Island has a Hyotantsugi on top.

Daddy Walrus shows the class the cinema on board the Memorial in The Hijacked Airship. Hyotantsugi are dancing on the screen.
Also, the Spider character ("Here ta meet ya") appears once in the 80s series:

Spider takes Uran into Hellywood Studios in The Robot Stuntman.
Astroboy Manga, vol 10:
"'N how could we forget...? Yup... I dunno why, but I'm called 'Spider', Yup... Here ta meet ya. Here ta meet ya. Here ta meet ya."