Yes, the "moss" is the base glass, described in some ads as being like "moonstone".
The Ades are Moss Agates. Ades is the collector name for them.
Akro sold them as Moss Agates and was very proud of them. To some of us "moss agate" means "boring patch" ... but that's not how it was then. Moss Agates were some of Akro's most expensive marbles -- the featured part of their line.
For a time Moss Agates were advertised as having "exquisite patterns". Patches don't have "exquisite patterns". That ad had to be written about swirly or corky ones.
Collectors now call them Aces and Ades. And I call the Ades "Ades" myself. I just have a hard time calling some of them Aces because Akro actually used the name Ace and used it for a different marble. ... and because other than the blue ones I've never been quite sure which marbles collectors were calling Aces.
Akro didn't call any marbles Ades, so I'm fine with that one as a collector's name. And definitely they're not Prize Names. The white glass of prize names would be opaque.