You can use a limb with an upturned KD, Bonekneepad or even a rockne. You could line that with a thin limb to give it more shape.
You could also try to construct a simple one by simply having 3 limbs side by side on the tail and playing with the size of muscle and joints as well as limb length untill it looks similar. Or even just one but with 3 joints close together with the middle one much thicker.
Painting it will help define it a lot too, keep in mind what textures you use with regards to parts (bone parts obviously pick up less colour and texture, although the overturned parts will pick up base colour)
Just mess with different techniques and don't be afraid to try new things, you will get there in the end