Where does “potomato” come from?

potomato (English) comes from English tomato, from Spanish tomate, from Classical Nahuatl tomātl, from Proto-Nahuan *toma- — tomatillo.

Ancestry of “potomato”, step by step

potomato traces back through two separate lines of ancestry.

via English tomato

StepLanguageWordMeaning
1EnglishtomatoA widely cultivated plant, "Solanum...
2Spanishtomatetomato; tomatillo; hole
3Classical Nahuatltomātltomato
4Proto-Nahuan*toma-tomatillo

via English potato

StepLanguageWordMeaning
1EnglishpotatoThe tuber of a plant, "Solanum tuberosum", eaten...
2Spanishpatatapotato; piece of rubbish
3Taínobatatasweet potato
Every word from Proto-Nahuan *toma-Every word from Classical Nahuatl tomātlEvery word from Spanish tomate