Arm, hand, leg, foot, fingers, toes

This is often a slightly confusing topic, so here is some clarification.

leg - רגל
foot - כף רגל [leg spoon!]
But if you were to say my feet are cold you can say הרגליים שלי קרות, so it's shortened to just רגל.

same with hand and arm 
arm - יד 
hand - כף יד (or יד) [arm spoon!]

Fingers and toes are both אצבעות. 
But usually when talking about toes say אצבעות ברגליים,  
There are different names for your specific toes and fingers: 
thumb - אגודל  
big toe on your foot - בוהן.