Similarly in Photius, Lexicon tau233 Theodoridis (see also tau234), with other references there; Photius has nominative singulars throughout rather than the Suda's accusative plurals. It seems that the Suda (and later the Etymologicum Magnum) has misconstrued the -ous suffix of the headword (quoted from Attic comedy: see below).
LSJ s.v. (web address 1): "nursed by a grandmother, spoilt child, mollycoddle o)knei=s lalei=n; ou(/tw sfo/dr' ei)= thqalladou=s; Com. Adesp. 17, cf. Poll. 3.20, Phryn. PSp. 113B., Hdn.Gr. 2.928, Suid.: -- but this interpretation constantly alternates with mammo/qreptosm as if from ti/tqh, not th/qh. — Other forms occur, viz. thqallwdou=s (-ammw- cod.) in Hesychius, cf. EM 756.31; thqela=s sch. Ar. Ach. 49; thqeladou=s Phryn. 267; thqalw/dhs Zonar."
Golden (see Bibliography): "Ancient scholars explain the words thqalladou=s, "granny's boy" (found in Attic comedy) and mammo/qreptos, "reared by a grandmother" (known only from late sources) as referring to spoiled children." He too cites for thqalladou=s Comica adespota fr. 17E (cf. Pollux 3.20; Eustathius, Commentary on the Iliad 971.39, and he adds that "A boy in a Roman comedy is said to be fortunate because he has two grandmothers (Plaut.Truc. 808)."