We have the word 'carrion', which means the flesh of dead animals, not fit for human consumption. For example, vultures are supposed to eat carrion. In other words, they don't kill the animals that they eat; they just eat the dead animals that they find! However, we wouldn't use normally use the word 'carrion' for dead fish. I think we would just say 'dead fish'; if it were fit for human consumption, we would say 'fish' and assume that it was dead! :-)

I agree with Doug and Hmano, the word is carrion. If you specifically mean animals that are dead from being hit by a vehicle and lie in the road, it's "roadkill".

I don't think there is a word for that in English. If i were to see a dead animal, I would just say that it's dead. If you can't eat the meat of the animal, we'd say that the meat is "rotten" or that "it has gone bad". Sinonim is spelled synonym. And we'd also say "Synonym for "dead", rather than "to dead". I hope this is helpful!

Maybe carrion is the correct word. https://en.wikipedia.org/wiki/Carrion

well... the word is "carrion" as Doug and Jude said. ... GOOD LUCK AND HAVE FUN !!! :))))