A non-standard or archaic past tense form of 'frappe,' rarely used in modern English.
Hypothetical formation adding -ed to 'frappe,' though 'frappéd' or simply 'frapped' is the standard English past tense form.
This is likely a false or ghost word—English grammarians would never accept it since 'frappe' already works as past tense or you'd say 'frappéd,' showing how English has strict rules about which words accept which endings.
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