Is there a name for this?

Is there a name for the condition/situation where a person’s lower leg doesn’t have a well-defined calf or ankle but just sort of tapers down into the foot?

“Fat ankles” is the obvious answer, but I have seen this on people who were by no means fat. I would prefer a more clinical term.

Not clinical, but ‘canckles’ is a common term for this.

What is the derivation of that term?

Well. . . it’s possible. . . .