1) Aviary sound 2) Baby bird sound 3) Bird word 4) Brood sound 5) Call from a tree 6) Call from the coop 7) Chick noise 8) Chick sound 9) Chickadee sound 10) Chirp 11) Coop call 12) Coop cry 13) Exclusively Saxon word 14) Exclusively Anglo word 15) High cry from a nest 16) High-pitched call 17) High-pitched sound 1) Chirp 2) Chitter 3) Peep 
• (v. i.) To chirp, as a young bird. • (v. t.) To give expression to in a chirping tone. • (n.) A chirp, peep, or squeak, as of a young bird or mouse.
Cheep (chēp) intransitive verb [ imperfect & past participle Cheeped (chēpt).] [ Confer Chirp ]. To chirp, as a young bird. Cheep noun A chirp, peep, or squeak, as of a young bird or mouse. Cheep transitive verb To give expression to in a chirping tone. « Cheep and twitter twenty million loves. Tennyson. » 
[n] - the short weak cry of a young bird
peep noun the short weak cry of a young bird
to chirp; peep. · to reveal or tell a secret (usually used in the phrase cheep it).