Pipe in a Cave
From the Super Mario Wiki
The Pipe in a Cave is a scrap found in Paper Mario: Sticker Star. Mario is required to retrieve it in Snow Rise by traveling through the second level of the ice flow and using a Fire Flower to melt a snow pile of which the scrap is situated in.
Mario must then travel past the area with two Snow Spikes throwing snowballs and place the Pipe in a Cave into a blank area in a small alcove, allowing him to progress.