West Frisian froask

← Proto-Germanic *fruskaz (inherited)

← Proto-West Germanic *frosk (inherited)

← Proto-Indo-European *prew- (derived)

← Old Frisian *frosk (inherited)

→ English frosh (cognate)

→ Old English frosc (cognate)

→ German Frosch (cognate)

→ Dutch vors (cognate)

→ Pennsylvania German Frosch (cognate)