Anonymous Grammarians is a shelf of school grammar, not one grammarian. One papyrus treats noun declension: Tiryns; Meno in the genitive Menōnos; Drakōn, Drakontos, Drakonti; then astēr, batēr and like forms, with a note that similar nouns are not always shaped alike, so you cannot Hellenize their number without analogy.
Other pieces in the same eul_aid cover Aeolic, a compendium of Herodian, fragments of the old supplements to Dionysius Thrax, and further declension and syntax scraps. Wouters, The Grammatical Papyri from Graeco-Roman Egypt (Brussels, 1979), and Uhlig, Grammatici Graeci 1.1 (Leipzig, 1883), pp. 105–132, are the hosted editions.
The slot is those classroom remains — paradigms and epitomes — not a missing author of a Techne.
Available Works
Also published as PDF.