I just went through and retagged all tagged jack_o_lantern and jack-o-lantern to jack_o'_lantern. May I recommend that:
jack_o_lantern aliases to jack_o'_lantern
jack-o-lantern aliases to jack_o'_lantern
Reasoning: Jack o' lantern is the proper spelling, but I don't expect taggers to remember that. This way, it's all unified under one tag.
Also, as jack-o-lantern apparently implied pumpkin, may I recommend that:
jack_o'_lantern implies pumpkin
Reasoning: I very much doubt we're going to see jack o' lanterns carved out of turnips here on e621.
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On a rhetorical note, why do I lately get images of a pumpkin-headed, undead Micheal Jackson when I think "jack o' lantern"? :\
Updated by 123easy