My older son is three and and a half and autistic so doesn't really have the concept of asking for things or enough language to express it if he did.
I did try asking him what he would like for Christmas to see what he would say (he probably just interprets the question as 'What would you like?') his answer was a pig.
We have that pretty covered as my brother is buying him the Peppa Pig rocket, he has a pack of two Peppa Pig figures in his stocking from Father Christmas and I am buying him the Playmobil pig pen set from his little brother.
I have a feeling he means a real pig though.
He will be over the moon with pretty much any toy animal. He is having a few Playmobil animal sets, some Schleich animals and some Duplo animals (if I win my eBay bid today) so he is covered and will hopefully be excited.
My younger son is eight months old and really wants my older son's cuddly Mickey Mouse. He goes nuts with delight every time he sees it. He will be having his own cuddly Mickey Mouse for Christmas so he will definitely be happy.