Rename the frequently bought together button in WooCommerce.

rename-frequently-bought-together-add-to-cart-button.php

add_filter( 'woocommerce_product_single_add_to_cart_text', 'filter_product_single_add_to_cart_text', 20, 2 );
function filter_product_single_add_to_cart_text( $add_to_cart_text, $product ) {
    // Define your targeted product IDs in the array below
    $targeted_ids = array(22246, 22241, 22227, 22039, 22009, 22004, 21999, 21991);
    
    if (in_array($product->get_id(), $targeted_ids)) {
        $add_to_cart_text = __("PRE ORDER", "woocommerce");
    }
    return $add_to_cart_text;
}