The headword is the accusative plural of the masculine noun ska/loy (digger); see generally LSJ s.v.
The entry exactly follows the scholia to Aristophanes, Acharnians 879 (web address 1), where the headword occurs (in the context of the Theban trader offering ska/lopas, mole-rats, for sale to Dicaeopolis, apparently as a food item).
The blind-rat seems to be Spalax typhlus, the blind mole rat of eastern Europe and Asia; see LSJ s.v. a)spa/lac. Aristotle, History of Animals 605b31 (Balme, pp. 196-7), notes that this species thrives in Orchomenus, Boeotia (Barrington Atlas map 55 grid D4), northwest of Attica.