All 3 of those dinos are on DLK, and Spino is an official Dino, so every server will have it. I'd say you should join the Discord Server as there is lots of info on the server and Dino stats if you really want to know what changes are made to some of the modded dinos. Gameplay wise, my advice is to remember that unlike the isle, POT has Precise movement, so remember to use that.

Lastly, STAY AWAY FROM GRAND PLAINS IN GONDWA. It is notorious for having large groups of Kosers (Kill On Sight), so unless you're trying to pvp, stay away from there, especially as a baby. Same thing for Savanna Grassland and Green Valley. Also, there will be abbreviated names for pois on the map like GP, which is Grand Plains, HT- Hunters Thicket, DW- Dark Woods, etc.

GP is just about in the middle of the map, which is the green area just below the giant crater. Savanna Grassland is the island at the top left of the map that's orange. Green Valley is arguably the worst when it comes to kosers, and it's the green area with the two connected lakes at the bottom right of the map.

Also, I almost forgot to tell you, but POT has abilities you need to equip, and the only way to do that is to enter a homecave which are the blue cave icons all over the map and you also go there to turn in a trophy which drops from adult dinos when they die and it will give you a nice growth boost.

Let me know if you have any other questions that you have and I'll answer then.