A fun way to teach body parts in another language is to use cookie men. First teach the names of the body parts. You can use a white board, or you can do it verbally, if you follow the Charlotte Mason method. Then instruct them how to eat their cookie men; "Eat the cabeza first." or "Next eat the manos." You can also ask them to pick which part to eat next and they have to say the part in the language you are working on.
I got this idea from Powerglide Spanish, but they only had pictures of cookie men with body parts missing that the kids had to name. Having the real thing really heightened the interest for my boys.