We don't have synonyms for chiffchaffs yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are chiffchaff, chiff-chaff and chiff chaff.
(n) :
A small, common warbler, of species Phylloscopus collybita, with yellowish-green plumage that breeds throughout northern and temperate Europe and Asia.
(n) :
Any of several other species of the same genus.
(n) :
A small, common warbler, of species Phylloscopus collybita, with yellowish-green plumage that breeds throughout northern and temperate Europe and Asia.
(n) :
Any of several other species of the same genus.