Im sure you can, but I'm not really experienced in using the animated sprite node
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Thank you so much for your kind words. The character already does squash on landing by calling the squash_stretch() function in the fall state when checking if you are on the floor. You can change the amount it squashes, and stretches by changing the landingSquash, and landingStretch vars
To change the sprites on the player first you need to go to the player.tscn file, then click on the sprite node, and change the texture property.
Next you need to adjust the hframes, and vframes values to the amount of rows and columns your sprite sheet has.
Lastly you need to click on the AnimationPlayer node and remake the animations to fit how many frames your spritesheet has.
This video goes over the whole process: