`* Googling is not necessarily a good means of deciding here (else all drug articles would be named for their main US brand). PubMed listing of some 5,200 biomedical journals gives: 122 hits for ``Athlete's foot`` with a large overlap 149 for ``Athlete's feet``, but 1395 for ``Tinea pedis``. (Other ICD10 options of ``foot ringworm`` 2hits, ``Dermatophytosis of foot`` with 1446 & ``foot dermatophytosis`` with 1835 are not helpful here as they also include hits for nail infection of onychomycosis).      *`