My son had his tonsils out last month....

My instructions were.. First day just liquid, nothing hot.. Just stuff like water and sugar drinks like fizzy but with out the fizz, you can just stir a spoon in it to get the fizz out...

Second day, ice cream, and what we call here compot (well that is what it sounds like) basically mashed baby fruit,  with no lumps what so ever...

Third day, you can warm things up a little...

On the third day my son was asking for toast... I gave him some with just a little bit of butter on it.. He ate what he could..
The doc told me he'll tell me when he was ready for the hard stuff he could not eat it...  But he did...

My son is almost three and he recovered very quickly.. I think it took him three to four days to get back to normal..

I was told no milk or yogurt for at least the first two days....

my 4 year old is going to get his tonsils out in 2months also ourdr said toast is best and jelly

I had my tonsils removed when I was 23 and I was so looking forward to the ice cream afterwards... alas all I got was regular hospital food! My boyfriend ate that for me so I could get out of the place. It was agony, every time I swallowed I could feel the stitches.. I barely ate for the first week, I tended to live on soup as it was the only thing that didn't hurt.

I really feel for you wee one... if he doesn't eat well after his operation I do not think ice cream will hurt him! Foods like rice pudding will probably go down well too.

Lorna