dogs rolling on decayed matter is just coincidental. due to thick fur dogs roll to either scratch their back or to cool themselves up.
Another term for decayed organic matter is "humus".
no dogs tongues do not roll
Decayed organic matter
That would be necromass.
Dead Animals and plants?
decayed organic matter
Distemper
dogs mostly roll when wanted to be petted or wants to play.
compost
The Topsoil
humus
Living things that have been decayed