A whole chicken is probably too large to roast in most toaster ovens. You might try the regular oven instead or only roast pieces of the chicken. Make sure that the chicken is fully cooked before eating.
A whole frying chicken roasts just fine. Since fryers are usually smaller than roasting chickens, it doesn't take quite as long to roast one. Fryers are very tender birds so they are good when cooked...
Usually the chicken is braised in a dutch oven, which is a type of pot and roasted in a regular or convection oven. If you wish to use the dutch oven, heat couple tablespoons of oil in the pot, brown...
Yes, but probably not safely. Chicken is one of the most important things to cook through thoroughly (unlike beef foe example) and this is unlikely to be achieved in a toaster oven.