hoarfrost » whorefrost
Jess Anderson suggested on the Usenet newsgroup soc.motss (20 August 2005) that “whorefrost” might occur as an eggcorn. After all, the “hoar” of “hoarfrost” is opaque. I found a few examples that appear to be genuine (some are plays on words), but these could be simple spelling errors. On the other hand, the ‘bad woman’ connotation of “whore” might be vivid to some people, who take hoarfrost to be a nasty force of nature.