From the Super Mario Wiki
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Paper Spikes are paper forms of the regular Spike enemy that appear as enemies in Mario & Luigi: Paper Jam. Paper Spikes are encountered at Doop Doop Dunes and in Neo Bowser Castle, sometimes joined by their regular counterpart, Pokeys, and Spinies. They attack like their regular counterpart, by throwing a spike ball at one of the heroes or by holding it over their heads, making jumps ineffective.
Rare, shiny variants can also appear in place of the regular Paper Spikes in the same areas. These Paper Spikes have greater stats, though their methods of attack remain the same, and will always drop a Boo Biscuit and a LV 2 Character Card upon defeat.