Toby
Toby
I dont think it was a typo, they meant toby. Tobies are just another name for pufferfish, specifically smaller pufferfish from genera like Canthigaster.
As for the mantis question, i'd be more worried about the mantis having a go at the toby than vice versa. Although they are unedible due to the poisonous flesh i dont think the mantis will likely take that into account, especially if its a large smasher or an agressive species of spearer. So really i'd be worried about several things, firstly, A) the mantis shrimp killing but not eating the toby, B) killing AND eating the toby and therefore poisoning itself, or C) The possibility that the toby will in fact harm the mantis shrimp.
I personally think theres just too many factors to take into account and too many things that can go wrong for you to be able to sleep peacefully at night.
Hope this helped.
Caynus