Put a pinch of sugar on your tongue (infected area). Then put your tongue on the roof of your mouth. Wait until the sugar dissolves. Works like a charm for me.
I always get a burned tongue, my dad taught me to first, suck on an ice cube. once its gone wet some bread, (slightly) cut the wet bread into 4 squares and put 1 at a time in your mouth. the wet bread will help absorb the heat and cool it down. remember to use cold water!
A throat spray can be quite helpful if you want immediate relief from a burned tongue. This spray has pain relievers in it that can render the area numb and minimize the burning sensation for a couple of hours. This is one of the easiest home remedies for a burned tongue, aside from ice cubes, which may take some time before relief is achieved.