How to stretch a sprite in 2d?

Hello~

What I'm trying to do is

1- rotate a sprite toward player if the player is in the alert zone (it's a radius around the sprite).

2- If player enters in the danger zone(smaller radius than the alert zone), the sprite stretchs toward player and tries to touch player.

Basically, I want to make it looks like the frog's tongue catching a fly.

I was able to implement rotation but Not the other one...

Please help!