Is the fibula an tibia called the ankle or leg?

Lower leg: The fibula and tibia are the bones in the lower leg. They articulate (connect) with the talus to form the bones of the ankle joint.

It's the leg: The tibia and the fibula are the 2 bones located in the lower leg. The connect to the foot at the ankle joint. The ankle joint includes the talus bone from the foot. Therefore, with respect to your question, you are referring to the leg.