In general, headboards and frames are not safe for kids that like to jump on beds because they might fall and hurt themselves on the headboard. This may result in a serious injury such as a concussion.
The safety of the beds depends on the age of the child. If the child is young, say two or three, then no it is not safe because they could fall off and get hurt. If the child is say eight or nine...
Bunk beds are generally safe for children. Many bunk beds come with safety features such as safety railings on the sides. A lot of deciding what is "safe" also depends on the age of your children and...
If you want a good headboard or frame for a bed you can go to Pier One, Menard's or The World's Market. The best brand would be Sierra, Tempurpedic, Serta, Simmons and Hillsdale.