It might be thorny, but it does not need to be thirsty. This is thanks to “their microstructured skin surface, with channels in between overlapping  scales, [that] enables them to collect water by capillarity and passively  transport it to the mouth for ingestion”.

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Comanns et al. (2017) “Adsorption and movement of water by skin of  the Australian thorny devil (Agamidae: Moloch horridus)” https://doi.org/10.1098/rsos.170591 available at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5627102/