Bantam, Cornish hen, angel, babe, baby, baby-doll, banty, barn-door fowl, barnyard fowl, biddy, birdling, broiler, brooder, broody hen, buttercup, caille, calf, canard, caneton, capon, catling, chanticleer, chapon, cherub, chick, chickabiddy, chicken, chickling, chicky, cock, cockerel, colt, cub, darling, dear, deary, dindon, dogie, doll, domestic fowl, drake, duck, dunghill fowl, faisan, fawn, fledgling, foal, fowl, fryer, game fowl, gander, gobbler, goose, gosling, grouse, guinea cock, guinea fowl, guinea hen, hen, hen turkey, hon, honey, honey bunch, honey child, kid, kit, kitten, lamb, lambkin, litter, love, lover, nest, nestling, oie, partlet, partridge, pet, petkins, pheasant, pigeon, pigeonneau, piglet, pigling, polliwog, poulard, poulet, poult, poultry, precious, precious heart, pullet, pup, puppy, quail, roaster, rooster, setting hen, shoat, snookums, spring chicken, squab, stewing chicken, sugar, sweet, sweetheart, sweetie, sweetkins, sweets, tadpole, tom, tom turkey, turkey, turkey gobbler, turkey-cock, volaille, weaner, whelp, wild duck, yeanling

For further exploring for "duckling" in Webster Dictionary Online