cute aggression intensifies
These things can't like bite you or stab you with that spike, can they? I've never wanted to handle them the few times I've encountered them because I don't know what, if any, precautions to take.
Nope... they're harmless.
Permanently Deleted
They're baby horseshoe crabs lol
They are not triops, as the op noted, but triops are not only easy to grow, they are also terribly cannibalistic!
Here's a non Amazon link to buy them from a small business https://sciplus.com/prehistoric-triops-kit-aka-dino-shrimp/