We don't have synonyms for foodprint yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are footprint, hoofprint and woodprint.
(n) :
The environmental impact, or footprint, of food, including the amount of land required to sustain a diet, the amount of carbon dioxide produced, if the food is organic, and if it is local.
(n) :
The environmental impact, or footprint, of food, including the amount of land required to sustain a diet, the amount of carbon dioxide produced, if the food is organic, and if it is local.