I can crack my fingers and ankles indefinately, and knees, and hips indefinately. I can also usually crack elbows, shoulders, neck, toes, and sometimes wrists. Most of these either started cracking or started cracking much more frequently in the past 6 months. It can make a good distraction during boring meetings.
Ankles don't spontaneously crack while walking though. Sometimes they do it when first getting up to walk. Same with knees.
BTW, does this count as yes or no if you crack your ankles, but not while walking?