French word teston comes from Proto-Italic *torzeō (Burn, scorch.)

Detailed word origin of teston

Dictionary entry	Language	Definition
*torzeō	Proto-Italic (itc-pro)	Burn, scorch.
torreo	Latin (lat)	(of the cold) I nip, pinch.. I roast; bake.. I scorch, burn, parch.
tosta	Latin (lat)
testa	Latin (lat)	(transf.) a piece of baked earthenware. A piece of bone. A piece of burned clay, brick, tile. A sherd, potsherd. A sort of clapping with the flat of the hands (as if with two tiles), in token of applause, invented by Nero. An earthen pot, pitcher, jug, urn. Ostracon (= ὄστρακον). The shell of shellfish or of testaceous animals, shellfish, skull.
teste	Old French (fro)	Head.
teston	French (fra)

Words with the same origin as teston