If you defined a count variable to track the number of incorrect guesses, you could define a function to draw out the required parts. In the example below I assumed 3 incorrect guesses. I've added a 3 second pause so you can see the output.
import turtle, time
hangman = turtle.Turtle()
def draw_hangman(count):
if count >= 1:
hangman.circle(45)
if count >= 2:
hangman.right(90)
if count == 3:
hangman.forward(150)
time.sleep(3)
draw_hangman(3)