1. Which do you like, pizza or fried chicken?
2. Which do you like, pizzas or fried chicken?
#1 is supposed to be correct. Is #2 also acceptable?
Could you please give me an example that uses "fried chickens"?
I was taught that "fried chicken" was never used in the plural.
(Not a teacher)
'Fried chickens' is avoided for the same reason as 'pizzas'. They are types of food and are thus singular.
I can't think of any reason why you would want to use plural. Even so, it doesn't sound particularly wrong to use them in the plural form in this sentence.
When they're used to mean food, they will usually be expressed as uncountable nouns.
You may buy two 'cabbages'. But you eat 'cabbage'.
You buy chickens and pizzas, but you eat 'chicken' and/or 'pizza' (or even a chicken pizza).
The reason why 1. is alright is because you are specifying the amount of pizza. 'A fried chicken' means 'a whole chicken, fried' - this is not the same as 'fried chicken', the food.
You could equally say 'He bought pizza yesterday.' and 'He bought fried chicken yesterday'.
What Raymott said is how it is - both can be either expressed as uncountable when they are acting as a type of food and both can be expressed as plural when the specific amount is needed. The difference is that you can't have 'one fried chicken' without changing the meaning as I said before.