Pamper

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late Middle English (in the sense ‘cram with food’): probably of Low German or Dutch origin; compare with German dialect pampfen ‘cram, gorge’; perhaps related to pap1.

wiktionary

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From Middle English pamperen(“to cram with food”), from Middle Dutch *pamperen(“to cram with food”), frequentative of *pampen(“to stuff”), from Proto-Germanic *pamp-(“to swell”), from Proto-Indo-European *bamb-(“round object”), equivalent to pamp +‎ -er.

Cognate with West Flemish pamperen(“to cram with food, overindulge”), Middle Low German pampen(“to stuff oneself”), dialectal German pampfen(“to cram”), dialectal Danish pampe(“to boast, brag”).

etymonline

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pamper (v.)

late 14c., pamperen, "to cram with food, indulge with food," probably from a Low German source such as Middle Dutch (compare West Flemish pamperen "cram with food, overindulge;" dialectal German pampen "to cram"), probably from a frequentative of the root of pap (n.1). Meaning "treat luxuriously, overindulge" (transitive) is attested by 1520s. Related: Pampered; pampering.