Can croc shoes cause foot, ankle, knee injuries?

Crocs are. For the most part very comfortable. There are medical versions which are a bit more supportive. I'd suggest that they are less likely to cause injury than the omnipresent flip-flop.
Not usually. No more than any other shoe. Your shoes need to be fit properly to your foot. Many people with foot problems find crocks to be comfortable and wide enough for their feet and to accomodate their foot problems.

Related Questions

What protection should I have against ankle and knee injuries?

Ankle and knee. The best protection is a good conditioning and strengthening program with knowledge of your limitations. Increase strengthening by 10% or so per week to limit stress injuries to bones and soft tissues. Some like bracing or taping, but very large studies show mostly placebo effects, unless specifically used to protect a known prior imbalance/injury. Read more...

Can ankle pain be tied to previous or current knee injuries?

Absolutely. Pain in any leg joint (hip, knee or ankle) can be caused by a problem with that or any other leg joint. In the case of the ankle, a knee injury can change the angle at which the knee works, putting stress on the ankle and causing pain. Read more...
Compensation injury. Simple answer is yes. You can get a compensation ankle or hip injury after a knee injury from transfer of stress. Read more...