They’re a type of paly I actually have those same ones in my tank. Lol. I don’t know name just know they’re a pally for a frag with a little less than that for around $20. Pretty cool remind me of Venus fly traps for some reason.
Those don’t appear to be grandis but rather ones that trade as ‘mind blowing palys.’ They are, however, larger and potentially noxious so best to be conscientious when working with them.