Huge bruise ankle tripped. Can walk and run. It is swollen is it broken?

Possible. Particularly if it's a break in the fibula, or smaller bone in the lower leg, you could walk on it even if it is broken. The only way to be sure it's not is to get it x-rayed.
Probably Not. If you can walk and run with out pain, it probably is not broken. To make sure you would need an x-ray.