An obsolete or archaic spelling variant of 'crow' (the bird), or possibly a dialectal term.
Likely a variant spelling of crow, with roots in Old English 'crawe' or related Germanic words. The spelling reflects historical variations before English orthography was standardized.
Medieval and early modern documents show dozens of spelling variations for common animals—scribes would spell the same word differently on the same page, so 'croh' tells us about how fluid language was before dictionaries standardized everything.
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