This is a link to the Glasgow coma scale (used in UK and US) which sets out all the different types of coma. I don't know whether either 'low motor response' or 'vegetative state' would be at all appropriate for your context.

Phencyclidine and related disorders - dose, causes, DSM ...
www.minddisorders.com › Ob-Ps
... excessive sensitivity to sound; lack of muscle coordination; muscle rigidity or frozen posture ... Muscle control is poor, and the person may make repetitive movements, grind the teeth, or grimace. ... Muscles are rigid with twitching. In the comatose stage, which may last from one to four days, the person is in a deep coma.
Hyothermia
donsnotes.com/emergency/hypothermia.html
18 May 2010 – No shivering. Confusion. Muscle rigidity. Slow heart rate. 90-86, 32-30, Dialated pupils. Diminished reflexes. Stupor or coma. Rigid muscles.

https://www.google.com/webhp?source=search_app#hl=pt-PT&scli...
Diabetic coma, also known as hyperglycemia, is a condition in which the body does not have enough insulin and has too much sugar...
5. Body may become rigid or stiff due to the muscular reaction to the shock
http://www.brooksidepress.org/Products/OperationalMedicine/D...