Can an animal be both cold and warm blooded IE can there be an animal whose body temperature is maintained homeotherm or changes in the environment poikilotherm depending on circumstances?

Chameleons, frogs, lizards & some butterflies/moths.

Close to its surroundings if its 90 its somewhere near that.

Yes. When it's cold they're cold, when it's hot they usually lay in the sunlight to get hot.

No. Because even though the temperature is hot their body temperature stays cold and doesn't rise up.

Warm-blooded creatures, like mammals and birds, try to keep the inside of their bodies at a constant temperature. Cold-blooded creatures take on the temperature of their surroundings. They are hot...