We don't have synonyms for frumenties yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are frumentius.
(n) :
(chiefly historical) A porridge made by boiling hulled wheat, typically with additional ingredients such as milk, egg yolks, and/or almond milk, traditionally served with venison or porpoise.
(n) :
(chiefly historical) A porridge made by boiling hulled wheat, typically with additional ingredients such as milk, egg yolks, and/or almond milk, traditionally served with venison or porpoise.