Jan,
IMHO, if the pups are truly solid green, the likelihood of them subsequently producing variegated pups is low. I don't say "no possibility" because, as strange as it may sound, some of the roots or lower corm areas still may have variegated cells in them. Since roots are white, you'd never know unless the roots became exposed and took on a greenish color. But if that does happen and a pup arises from the area with variegated cells, you could get the odd variegated pup showing up from what appears to be an all-green plant!
This would only be possible when growing a pup that came from a variegated plant. Green pups from all green plants are very unlikely to produce variegated pups except via a new mutation.
LariAnn
