Oh dear, unfortunately the term 'scroddled' is a somewhat esoteric one from definitions of pottery types. My apologies.

It refers to the result of mixing clays of different colors so as to leave streaks of the original color of at least one.

Here is a photo of one 'scroddled' item, the base of a small stoneware box used probably for snuff (the cover has a grid by which to shred something fairly soft, probably not a nutmeg). With it is the side of a similarly-sized box, earthenware, with a mixed-colors slip glaze that some mistake for 'scroddled' ware, but it's purely a surface treatment--probably a 'trinket box' for such things as collar studs. Both probably English, roughly middle of 19th century.

The marbles don't scan or photograph particularly well. You may be able to make out that while these were machine-made, there are seams that can be felt between the different-colored glasses. Perhaps the glasses had slightly different cooling/hardening rates due to different flux or other components. The red, white and green one has a distinct fold running through the red, just visible on its right side. Of these, most were distributed by the Christensen Agate Co., but some were sold either by Peltier Marble Co. or Akro Agate Co. The sort of waxy or mutton-fat appearance also did not scan well. I used to think this was due to a feldspar component in the glass, but now am not so sure.

Cheers,
Snap