| Language | Reflex(es) | Gloss | Grammar | Sources |
|---|
| English |
| Middle English | quav(er)en | to quaver | vb | W7 LRC |
| English | bufotenine | alkaloid found in toad skin | n | AHD LRC |
| English | quab | bog, morass, quagmire | n | IEW LRC |
| English | quack | quacksalver | n | W7 LRC |
| English | quacksalver | charlatan, pretender to medical skill | n | AHD W7 LRC |
| English | quaver | to shake, tremble | vb | AHD W7 LRC |
| West Germanic |
| Middle Dutch | quac- | liquid, unguent | pfx | AHD LRC |
| Dutch | kwakzalver | quacksalver | n | W7 LRC |
| Low German | quabbeln | to quaver, shake like jelly | vb | AHD LRC |
| Italic |
| Latin | būfō, būfōnis | toad | n.masc | AHD ELD LRC |