JollyGood seems to be targeted a lot by Newbies and junior members. I don't have to state the obvious: these accounts are (most likely) alts of tagged members or members in a signature campaign who don't want to reveal themselves or the accounts with some reputation and can't risk saying it from that account.

If there's a possibility that these accounts don't fall under the categories I've mentioned (Which is very low). In that case, I don't know how they learned so much about the forum in such a short period, being these low ranks and having recently registered, disregarding the possibility of them not being alts.