how do I make a tkinter window follow with text?

You can create a canvas with a frame inside to contain the widgets you would like to scroll; Create a scrollbar for the canvas and create widgets inside frame.

Use onFrameConfigure(canvas) listen to Frame size change, and use canvas.yview_moveto( 1 ) to scroll to the end of window.

Reference: Scrollbar in Tkinter grid

I also suggest to change the font for text art to monospaced fonts, e.g. consolas

import tkinter

from Treasure_Island_V2_art import Treasure_Chest, Pirate_Ship

def onFrameConfigure(canvas):
    '''Reset the scroll region to encompass the inner frame'''
    canvas.configure(scrollregion=canvas.bbox("all"))
    canvas.yview_moveto( 1 )

window = tkinter.Tk()

window.title("Treasure Island")
window.attributes('-fullscreen', True)
window.config(bg = "black")

window.grid_columnconfigure(0, weight=1)
window.grid_rowconfigure(0, weight=1)

# set Canvas and Frame for scrollbar

canvas = tkinter.Canvas(window, border=0, highlightthickness=0, background="black")
frame = tkinter.Frame(canvas, background="black")
scrollbar = tkinter.Scrollbar(window, orient="vertical", command=canvas.yview)
canvas.configure(yscrollcommand=scrollbar.set)

scrollbar.grid(row=0, column=1, sticky=tkinter.NS)
frame.grid()
canvas.grid(row=0, column=0, sticky=tkinter.NSEW)
canvas.create_window((canvas.winfo_screenwidth()/2,0), window=frame, anchor=tkinter.CENTER)
frame.bind("<Configure>", lambda event, canvas=canvas: onFrameConfigure(canvas))

# Create widgets inside Frame

logo = tkinter.Label(frame, justify='left', text = '''
          |                   |                  |                     |
 _________|________________.=""_;=.______________|_____________________|_______
|                   |  ,-"_,=""     `"=.|                  |
|___________________|__"=._o`"-._        `"=.______________|___________________
          |                `"=._o`"=._      _`"=._                     |
 _________|_____________________:=._o "=._."_.-="'"=.__________________|_______
|                   |    __.--" , ; `"=._o." ,-"""-._ ".   |
|___________________|_._"  ,. .` ` `` ,  `"-._"-._   ". '__|___________________
          |           |o`"=._` , "` `; .". ,  "-._"-._; ;              |
 _________|___________| ;`-.o`"=._; ." ` '`."` . "-._ /_______________|_______
|                   | |o;    `"-.o`"=._``  '` " ,__.--o;   |
|___________________|_| ;     (#) `-.o `"=.`_.--"_o.-; ;___|___________________
____/______/______/___|o;._    "      `".o|o_.--"    ;o;____/______/______/____
/______/______/______/_"=._o--._        ; | ;        ; ;/______/______/______/_
____/______/______/______/__"=._o--._   ;o|o;     _._;o;____/______/______/____
/______/______/______/______/____"=._o._; | ;_.--"o.--"_/______/______/______/_
____/______/______/______/______/_____"=.o|o_.--""___/______/______/______/____
/______/______/______/______/______/______/______/______/______/______/_____ /
''')

logo.grid()
logo.config(font=('consolas', 15), fg = "green", bg = "black")


line1 = tkinter.Label(frame, text=("Welcome to Treasure Island,n"
                                    "Your goal is to find the buried Treasure!"))

label1 = tkinter.StringVar()

a = tkinter.Label(frame, textvariable=label1, font = ('arial', 20), fg = "blue", bg = "black")

a.grid()
for i in line1.cget("text"):
      a=label1.get()
      label1.set(a+i)
      window.after(50)
      window.update()

space = tkinter.Label(frame, text=" n n ")

space.grid()
space.config(bg = "black")

line2 = tkinter.Label(frame, text="You wake up to find yourself laying in the middle of a deserted beach,n"
                                   "you feel hungry but you see something that catches your eye.")
label2 = tkinter.StringVar()

b = tkinter.Label(frame, textvariable=label2, font = ('arial', 20), fg = "blue", bg = "black")

b.grid()
for i in line2.cget("text"):
      b=label2.get()
      label2.set(b+i)
      window.after(30)
      window.update()

window.mainloop()