public class Entity
    {
        public event Action<int> OnUpdateFrame;

        internal void OnNewTick(int tick) 
        {
            OnUpdateFrame?.Invoke(tick);
        }
    }

    public class Frog : Entity
    {
        public Frog() 
        {
            OnUpdateFrame += Frog_OnUpdateFrame;
        }

        private void Frog_OnUpdateFrame(int obj)
        {
            throw new NotImplementedException();
        }
    }

    public class SuperFrog : Frog
    {
        public SuperFrog() : base()
        {
            OnUpdateFrame += SuperFrog_OnUpdateFrame;
        }

        private void SuperFrog_OnUpdateFrame(int obj)
        {
            throw new NotImplementedException();
        }
    }