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An interesting application might be the grow media for hydroponic farms. While visiting an aquaponics farm it seemed the grow media was styrofoam based which didn't seem quite right. An organic based solution that's also biodegradable would seem much better/safer.

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It might depend on the exploitation, but most raft methods (floating styrofoam board) I've seen will reuse the board so it's really not as bad as it seems.

As for the safe part, the concentration of plastics in the nutrient solution might be a tad higher, but the plant will only pick up a small fraction or none of it so there aren't any big health concerns on that front.

In the same way that food will only pick up a small fraction of teflon from a nonstick pan, so there shouldn't be any big health concerns?

Not really no, more in the sense that plants growing in a field with more lead (not lead contaminated, just above-average) might pickup a bit more lead from the soil and still be good for human consumption.

Teflon is toxic when vaporized (>300°C). Solid teflon is nontoxic.

Same way there’s a small amount of cyanide in most apple seeds

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