private string coroutine_Name = "FrogJump";

void Start()
    {
    StartCoroutine(coroutine_Name);
    }

IEnumerator FrogJump()
    {
        yield return new WaitForSeconds(Random.Range(1f, 4f));

        animation_Started = true;
        animation_Finished = false;

        if(jumpLeft)
        {
            anim.Play("FrogJumpLeft");
        }
        else
        {

        }
        StartCoroutine(coroutine_Name);
    }