I think it makes sense to have a sponge-like block that works for lava, the same way 'sponge' works for water.
It could be called "Pumice" & "Saturated Pumice", after the Pumice rock that forms from volcanic eruptions that is light-weight and full of porous cavities (just like the 'Sponge' block).
It could be found as a treasure item in Nether Fortresses, just like Sponge is found in Ocean Monuments.
When you use it to soak up lava, it changes from Pumice, to Saturated Pumice.
You could change it back by 'melting' the lava out of it in a Blast Furnace.
Would make it a lot easier to clear out magma chambers in the Overworld to get to Ores, and to drain sections of the Nether, to create under-lava hidden bases.
It could have a texture similar to Sponge, except grey or black. Which would help it double as a nice decorative block.
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