i dont know if this was already discovered but i looked in the yoshi boards and didnt find it soo im going to post it aha
yoshi's down B can be used infinitely on yoshis island on the slanted ends(next to the edge)
if you do your Down B in roughly the middle of the slant and keep pressing down B yoshi will just stay in the same spot still causing the stars not really sure what this can do but it looks pretty funny
EDIT: all you have to do is roll to the edge and jump and then keep tappin Down-B and it will work =D
yoshi's down B can be used infinitely on yoshis island on the slanted ends(next to the edge)
if you do your Down B in roughly the middle of the slant and keep pressing down B yoshi will just stay in the same spot still causing the stars not really sure what this can do but it looks pretty funny
EDIT: all you have to do is roll to the edge and jump and then keep tappin Down-B and it will work =D