Check out the Lost Media Wiki's article on the Purple Yoshi Tech Demo!!!
Note: I Am Sorry if it's already been uploaded to the archive wiki
There was a Purple Yoshi Tech Demo Which was made for the Game Boy Advance, IGN pocket posted a Watermarked screenshot, Which having mecha Wigglers like spiders attacked the Purple Yoshi. No Information has been surfaced, Probably a destroyed media and Lost forever and no sound track has been surfaced,
In the photo, Red spots are Shown aiming on the Enemy, It Might have eggs made it to the Game, Might giant eggs similar to the big eggs from Yoshi's new island.
https://www.mariowiki.com/Tech_demo is the place where i got the fact