The smaller gray crobs that pop out of the sand may not be played by actors, but they do still have names. Each have different identifying "butt tattoos".
Martini Glass: Jenny
Clawdio has a leaf tattoo like Sylvia, though the resemblance is purely coincidental, and they are not twins. He is named after royal critten Clawdio, has a golden shell, and is the son of Unchanged Salt Shaker and Small Beachball. (Timesprite).
Figgy has a martini glass tattoo like Jenny, though the resemblance is purely coincidental, and they are not twins. She has a golden shell and is the daughter of Unchanged Snail and Big Arrow.
Casha is a chrome gilded crob adopted by Sasha and Small Golden Coaster shortly after their wedding ceremony.