Getchildren not a member of Frame?

The error for this script says " GetChildren is not a member of Frame" on line 12, what is wrong with line 12?

local BUTTON = script.Parent
local ITFRAME = BUTTON.Parent.Parent
local FRAME = ITFRAME.Hull
local NAME = BUTTON.Text
local ITEMNAME = FRAME.Itemname
local SCROLLINGFRAME = ITFRAME.ScrollingFrame
FRAME.Visible = false

function on_button1_down()
	
	for I,v in pairs (ITFRAME:Getchilrden()) do --Here is the problem <<<<<<
if v.Name ~=  SCROLLINGFRAME-- item to avoid
then v.Visible = true
else v.Visible = false

	ITEMNAME.Text = NAME
	
	FRAME.Visible = (not FRAME.Visible)
end
	end
	end
BUTTON.MouseButton1Down:connect(on_button1_down)

That's a pretty simple problem and can easily be solved with a for _, fr in pairs(TlFrame:GetChildren()) do which will do the stuff inside of this and an end to anything inside of this table.

local BUTTON = script.Parent
local TlFRAME = BUTTON.Parent.Parent
local FRAME = TlFRAME.Arbalest
local NAME = BUTTON.Text
local ITEMNAME = FRAME.Itemname

FRAME.Visible = false

function on_button1_down()
    for _, fr in pairs(TlFrame:GetChildren()) do
        if fr ~= FRAME then -- This will prevent the content of the FRAME variable from being changed.
        fr.Visible = false
        end
    end
    ITEMNAME.Text = NAME
    FRAME.Visible = (not FRAME.Visible)
end

BUTTON.MouseButton1Down:connect(on_button1_down)

If this doesn't help you with your problems or isn't what you needed, simply reply in a comment and I'll see what I can do.

You wrote "Getchilrden" instead of "GetChildren"

local BUTTON = script.Parent
local ITFRAME = BUTTON.Parent.Parent
local FRAME = ITFRAME.SmallHandle 
local NAME = BUTTON.Text
local ITEMNAME = FRAME.Itemname
local SCROLLINGFRAME = ITFRAME.ScrollingFrame

FRAME.Visible = false

function on_button1_down()
    for _, fr in pairs(ITFRAME:GetChildren()) do
        if fr ~= SCROLLINGFRAME then -- This will prevent the content of the FRAME variable from being changed.
        fr.Visible = true
elseif fr ~= FRAME then
		fr.Visible = true
else fr.Visible = false
        end
    end
    ITEMNAME.Text = NAME
end
BUTTON.MouseButton1Down:connect(on_button1_down)

Here is the edited script, It works except it doesn't make all of the other frames that aren't (FRAME) not Visible. I thought else fr.Visible = false would do that because else in this situation would be All of the frames other than SCROLLINGFRAME and FRAME right? But it didn't work