Question

when same sprite is shown in different looks it is called​

Answer 1

A costume is one out of possibly many "frames" or alternate appearances of a sprite. Sprites can change their look to any of its costumes.

Answer 2

Answer:

The current costume of a sprite can be changed by clicking on the "costumes" tab and clicking on the desired costume of choice, or by using Looks blocks to select the sprite's costume. New costumes for the sprite can be imported, created, and edited in the Scratch Paint Editor.