This was an an English-language children's cartoon from the 1980s or earlier.
It featured a girl with pigtails riding through underground tunnels on a gigantic (sandworm-sized?) green worm.
This was an an English-language children's cartoon from the 1980s or earlier.
It featured a girl with pigtails riding through underground tunnels on a gigantic (sandworm-sized?) green worm.
Solved. Turns out it was Guph's Giant Dirt-Devouring Worm in a few episodes of The Wonderful Wizard of Oz (1986) such as Gnomes on the March and was more of a blueish colour with perhaps a tinge of green.
Nausicaä of the Valley of the Wind