First, for the purposes of this question, I am narrowing the analysis to Jews who keep kosher, e.g. follow the dietary laws, and also ignoring any personal Allergies.
No. Jews have particular dietary requirements called Kashrut. There are many kosher laws. Here are a few highlights:
Jews who eat kosher will not eat snails since snails are not kosher. However, not all Jews eat according to the laws of kashrut, so some Jews do eat snails.
Observant Jews do not eat crayfish.
Muslims and Jews don't eat pork. Muslims eat shellfish, but Jews don't.
Orthodox Jews are only allowed to eat kosher foods.
Jews eat food -- observant Jews attempt to keep the laws of kashrut by eating kosher food. When? Many Jews eat 3 meals a day with occasional snacks. Some skip breakfast.
no, it is because God's Torah forbids Jews to eat pork. Non-Jews are permitted to eat it.
Yes, Jews can eat chicken. Religiously observant Jews would require that the chicken be kosher.
because a WW2 man blamed everything on the Jews
Yes, Jews; as well as Muslims; can eat duck meat,
Religiously observant Jews will only eat foods that are kosher.
The Torah states that Jews should eat kosher food.
There is no food that all Jews eat by dint of the fact that all Jews are different people with different tastes and choices.