From the Super Mario Wiki
Paper Bob-ombs are paper forms of Bob-ombs that appear as enemies in Mario & Luigi: Paper Jam. Paper Bob-ombs are commonly found at Doop Doop Dunes, with higher level Paper Bob-ombs found at Sunbeam Plains and Neo Bowser Castle during the mission Final Smash. Paper Bob-ombs are among the few enemies in the game whose regular counterparts cannot be fought normally; King Bob-omb does use regular Bob-ombs as projectiles
Rare, shiny variants can also appear in place of the regular Paper Bob-ombs, and have higher stats like all shiny paper enemies. The Shiny Paper Bob-ombs at Doop Doop Dunes will always drop a Mushroom and a Double 1-Up Mushroom; the ones at Sunbeam Plains and Neo Bowser Castle always drop a Super Mushroom and a Shiny Battle Card when defeated.
Paper Bob-ombs have simple attack patterns, ramming into the Mario Bros. in order to damage them. After attacking a Paper Bob-omb, its fuse will light, and its next attack will result in an explosion which will defeat the Paper Bob-omb and may leave its target Dizzy.
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