Ниже вариант исправленного кода.

```python
import turtle

turtle = turtle.Turtle()
turtle.shape('turtle')
turtle.color('green')

turtle.circle(50)
turtle.penup()

turtle.goto(-50, 0)
turtle.pendown()
turtle.begin_fill()
for i in range(2):
    turtle.forward(100)
    turtle.right(90)
    turtle.forward(130)
    turtle.right(90)
turtle.end_fill()
turtle.penup()

def draw_leg(dx, dy):
    turtle.goto(dx, dy)
    turtle.pendown()
    turtle.begin_fill()
    for i in range(2):
        turtle.forward(30)
        turtle.right(90)
        turtle.forward(25)
        turtle.right(90)
    turtle.end_fill()
    turtle.penup()

draw_leg(50, -20)
draw_leg(-80, -20)
draw_leg(50, -90)
draw_leg(-80, -90)

turtle.goto(-5, -130)
turtle.pendown()
turtle.begin_fill()
for i in range(2):
    turtle.forward(10)
    turtle.right(90)
    turtle.forward(30)
    turtle.right(90)
turtle.end_fill()
turtle.penup()
```

Я вынес рисование ног черепахи в отдельную функцию `draw_leg`.
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