How to perform a function to multiple objects?

I am trying to tween the color of all ImageLabels that is a descendant of Frame. I would do GetAllChildren() however, there are other objects besides Image Labels in the Frame.

How would I reference ALL image labels in the Frame as one variable? That way I can easily perform actions to them.

local Button = script.Parent:WaitForChild("Button")
local Frame = script.Parent


function debounce(func)
    local isRunning = false    -- Create a local debounce variable
    return function(...)       -- Return a new function
        if not isRunning then
            isRunning = true

            func(...)          -- Call it with the original arguments

            isRunning = false
        end
    end
end

function isImage( Image )
    return Image:IsA("ImageLabel") and Image:IsAncestorOf(Frame)
end



Button.MouseButton1Down:connect(debounce(function(func)

print('Button pressed!')


local color3 = Color3.new
local vec3 = Vector3.new

local vec3toColor3 = function(vec)
    local newvec = vec3(vec.x/255, vec.y/255, vec.z/255)
    return color3(newvec.x/255, newvec.y/255, newvec.z/255)
end

function color3toVec3(col)
 return vec3(col.r*255, col.g*255, col.b*255)
end

function tween_color(start_color,end_color,alpha)
local start = start_color
local endme = end_color
local startvec = color3toVec3(start)
local endvec = color3toVec3(endme)
return vec3toColor3(startvec:lerp(endvec,alpha))
end
while true do
    for i = 0,1,.1 do
    Image.ImageColor3 = tween_color(color3(81, 183, 255),color3(36, 79, 113),i)
    wait(.1)
    end
    for i = 1,0,-.1 do
    Image.ImageColor3 = tween_color(color3(81, 183, 255),color3(36, 79, 113),i)
    wait(.1)
    end     
end
end))