Lukaku, Haaland, Nistelroy, Drogba are 4 which I just read. Do you want a 1000?
No, i actually want players who are physical CFs who aren't poachers (Lukaku and Haaland, but ok apart from them 2).
Drogba? Did you read the question? He played in the french 2nd division until almost 23. He didn't have a good scoring season til his 24/25 age season.
Van Nistelrooy? Dutch 2nd Division at that age. Was 22/23 when he exploded in the Dutch league, 25 when he moved to a serious league.
The reason you can't find any information on them is because it's not a big list. I literally went through this in the summer. Kane barely played in his age 20 season. Ibra was 23 when he moved to Italy. Lewandowski was in Poland until 22 and then took a year to adapt in Germany. Henry was 22 when he started actually scoring. Cavanis first ok seasons were at 21 and 22, but didn't actually start being a good scorer til 23. Dzeko 21 when he moved to Germany, 22 when he started scoring regularly. And on and on and on.
I looked at the list of the best CF's over the past 25 years or so, and then checked their numbers from a young age. The players with a better scoring rate, age 19 season like Hojlund last season, in one of the bigger leagues (top 7 just to include Portuguese and Dutch even if it's significantly weaker) over the past 30 years are Brazilian Ronaldo, Haaland, Lukaku, Torres, Aguero, RvP (Dutch league), eto'o and Rooney (basically same record, 0.45 goals per 90 vs 0.44).
Hojlund ahead of Makaay, Cavani, henry, Suarez, Benzema, Higuain, Adriano.
These guys weren't playing in a serious league or weren't playing at all: David Villa, Andy Cole, Shearer, Vieri, Shevchenko, Osimhen, mario Gomez, Lewandowski, Kane, Ibra, Huntelaar, Dzeko, Falcao, Drogba. Most of these not doing anything until about age 22.
And even breaking down this list, I'd say the players that Hojlund actually plays similar to are all in that bottom list of guys who took longer. He's not a poacher, he's a physical CF who competes physically all day. That's a skill that takes longer to grow, which makes sense, as he's now competing with premier league defenders.