Hi,
Your little one has undergone a surgery .Since the throat seems to br alright i guess you can relax.Sometimes when small kids get
fever they become delirioius and talk incoherantly.Probably that episode was one of those deliriuos state.If he has pain give him painkiller that will relieve him .If he suffers from fever then he might need some investigations to rule out infection.
Bye
Take Care