ImageMagick

source: https://www.ostechnix.com/create-animated-gif-ubuntu-16-04/

• heisted a 'sticker' png from facebook messenger
• cropped it at 150x150 for 12 images
• created GIF from cropped images
• use convert & specify a group of images

convert -delay 3 -loop 0 throw_hearts_cr*.png bunny.gif