Your ifcheck is always true. What are you trying to check?
Also, you should put the 'frog' declaration in Awake(), so it's not looked up every frame.
function Awake ()
{
var frog = GameObject.Find("try"); // Set it once here, so it doesn't search every frame
}
function Update ()
{
if (frog.transform.position(0+1,0+1,0+1)) // This will always be true - you are just setting the position
animation.CrossFade("jump");
else
animation.CrossFade("idle");
}