подпапка означает в английский

subdirectory [subdirectories]▼(directory located inside another directory)
noun
[UK: sˌʌbdaɪrˈektəri] [US: sˌʌbdɚrˈektɚri]

subfolder▼(folder within another folder)
noun
[UK: sˈʌbfəʊldə] [US: sˈʌbfoʊldɚ]