sillock in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
Etymology
From sill(“newly hatched young of fish, fry”) +-ock, ultimately from Old Norsesíl/síld(“herring”), whence also dialectal Swedishsil(“the young of fish, fry”) and Norwegiansil(“sand-eel”). More at sile.