PNG are in the same group as Zimbabwe, India and Australia.
They have beaten Zimbabwe once in their history but have never beaten the other two teams. Campbell said his young side had definitely targeted the Zimbabwe game as a possible win.
But Radio New Zealand reported that Campbell said anything could happen against the other two sides when pressure was applied.
"They're probably under more pressure than us, India and Australia. They are coming in to play an associate member who has performed quite reasonable so we are looking forward to it.
"We think long term future in Cricket PNG so we have high hopes that six to seven of these young boys in the next one or two years could be [senior] Barramundi players so we rate them quite highly but we understand the task at hand."
This is the 12th edition of the Under-19 Cricket World cup and the third on New Zealand soil, following previous events in 2002 and 2010. The 48-match tournament will take place from January 13 to February 3.
Sixteen teams will compete in the tournament, with the 10 Test-tier nations joined by six qualifiers. West Indies come to Aotearoa as defending champions, after beating India in the final of the 2016 tournament in Bangladesh.