Thermoconformer is a related term of poikilothermy.
As nouns the difference between thermoconformer and poikilothermy
is that
thermoconformer is any organism whose body temperature changes according to the external temperature, rather than carrying out thermoregulation while
poikilothermy is (biology) the quality of having a body temperature that varies or fluctuates, depending on the temperature of the environment; cold-bloodedness.