What is the name of the long thin bone of the lower leg?

Look at the medial surface of the lower leg near the ankle. What is that large "bump"? What is the comparable projection on the lateral side of you lower leg near the ankle?
What bone of the foot articulates with the tibia and fibula?
What is the name of the "heel" bone?

The long thin bone of the lower leg is called the fibula.

The large "bump" on the medial surface of the lower leg near the ankle is called the medial malleolus. On the lateral side of the lower leg near the ankle, the comparable projection is called the lateral malleolus.

The bone of the foot that articulates with the tibia and fibula is called the talus.

The name of the "heel" bone is the calcaneus.