Hi there, welcome to the community.
Files and Folders in your assets folder can be used like other database objects. You can pick a specific folder with:
$folder = DataObject::get_one("Folder", "Filename = 'assets/myfrontpageimages'");
From here it is probably easiest to get all images that have a parent ID equal to this Folders ID:
$images = DataObject::get("Image", "ParentID = '{$folder->ID}'");
The above code can be wrapped into a method in you Page class (with some additional checking that the folder exists):
function getFrontPageImages() {
$folder = DataObject::get_one("Folder", "Filename = 'assets/myfrontpageimages'");
return $folder ? DataObject::get("Image", "ParentID = '{$folder->ID}'") : false;
}
Now, from your template you can do:
<% if FrontPageImages %>
<% control FrontPageImages %>
$Tag
<% end_control %>
<% end_if %>
(FYI $Tag calls the Image method getTag() which propduces standard <img src=".." alt=".."> HTML for your template)
Hope this helps.