Yes and No
not exactly that term but I heard the word butcher about him before . but that was mostly before his presidency term. before that he was more an unknown person, with a dangerous background. but when he became "so called president" he was more like a stupid funny dumb guy people mock in a daily basis. I doubt anybody remember that nickname anymore
I have to give you guys a history lesson , I try to make it short
back in 1980s there was a very extremist group, in English called MEK (the remaining of them are living in Albania now, somehow the Iranian version of ISIS) at some point they sided with Iraq's dictator Saddam during the Iran/Iraq war and directly attacked Iran with a large group of soldiers. they got trapped and killed in "Operation Mersad".
but because of that Khomeini decided to "end" this group once for all. there were lots of MEK prisoners back in Iran ,most of them sanctioned with a short term, 2 or 3 years in jail. all of them had a re-trial. a very short one. 2 or 3 minutes with few questions and one wrong answer led you to receiving death penalty. (and they didn't know that, they thought it's just routine questioning) keep in mind they had nothing to do with the attack, they were in jail already. most of them were just supporting that group, not being part of their military actions. while being there, they also dealt with some other communist/leftist groups too with the same way.
those re-trials administered by a group of 4 judges (nowadays being called the "death committee") and Raeisi was one of them, he was young at the time and knowing his dumb personality, I don't think he had a big say in that group but still a part of it. so nobody is going to miss him (if he is really dead), except his stupid dumb mistakes.