From the Super Mario Wiki
Spike Blops are Spiny-like creatures who inhabit Bowser's body in Mario & Luigi: Bowser's Inside Story.
They reside in the Trash Pit. Their name might be based off of Spike Tops. They have slimy teal bodies that are protected by red shells covered with spikes. They can only be damaged by hammers and some special attacks. Mario and Luigi cannot jump on them in battle to attack or even in the field to trigger a fight, as they will simply land on the spines, take one point of damage and most likely forfeit their turn; the two special attacks Spin Pipe and Magic Window, being jump-based, cause the heroes to meet a similar fate. Spike Blops attack by shuffling across the screen towards a bro and must be knocked back by a hammer swing, dealing counterdamage. They also will sometimes crawl along the ceiling to fall spikes first on Mario or Luigi; their shadow indicates where they are aiming. This attack is countered with a hammer swing as well.
Names in Other Languages
|Pun on トゲゾー Togezō, meaning Spiny, and アメーバ Amēba, meaning Amoeba.
||Pun on Pinchón, which is the Spanish name of Spinies, and probably lastre, which means thing that stops, seizes or suspends.
||Pun on Hérisson, meaning hedgehog, and blop.
||Pun on bactérie, which means bacteria, and Hériss, which is the french name of Spinies
||From Zelle, meaning cell, and the German name of Spinies, Stachi
||From "Blob" and "Koopistrice", Spiny's Italian Name