Is my doctorate good enough? I received a doctorate from an online school Walden University. I have not had any luck finding a full time college teaching position. Should I pursue another Ph D from another reputable college? Can I use any of the coursework I already have to defray the expense?
There are many people who attend far more reputable institutions than Walden and accomplish significant amounts during their PhD program and still have problems finding meaningful teaching positions. It's unfortunate that you went through the entire program without realizing this.

Unfortunately, a lot of people think the process goes like:


Get PhD (in 3-4 years!)
Apply to a few great teaching jobs
Have to decide between multiple great offers


But the reality is often more like:


Get PhD... eventually
Apply to many jobs
Have a few interviews if you're lucky
Get rejected from most desirable positions
Decide to do a post-doc to get more teaching/research experience
Repeat while applying for post-doc positions


The academic job market is fairly saturated in many fields and so even if your degree was from an accredited and reputable institution, you may not have a simple case for getting a teaching job at a college. Particularly if your PhD experience did not lead to any teaching experience or publications.

I would recommend looking into local community colleges. It sounds like you did this online, which means you may have been working fulltime during your study - community colleges often have courses you can teach which you may be able to combine your academic study and work experience to be a desirable candidate.