Kukkonen is listed on Michigan Tech's 2022-23 roster on their website, so he'll be playing for them this season. Bowen is not on Vermont's, Callow not on Harvard's
Vermont's roster currently lists only 17 players: 2 goalies, 4 defensemen, and 11 forwards.
Here's a THW snippet on Bowen committing to Vermont:
With this season being his final one with the Chiefs, Bowen will be heading off to play collegiate hockey at the University of Vermont next season after
committing to the school last month. He had previously committed to the University of North Dakota when he was 16 but ultimately decided that the fit wasn’t right for him.
“I was pretty excited when I was a 16-year-old to commit to a school like that, but when you grow up, and you get more mature, you’ll realize that it’s about fit and not about the locker room and the facilities, and that’s what kind of wowed me with North Dakota.
“I have a lot more opportunity going into Vermont as a freshman than I would at North Dakota, so I just thought for my hockey career that it would be best to step into a team where I’m playing right away rather than maybe (being) in and out of the lineup.”