Populate Dropdown with Post Type

snippet.php

<?php
add_filter( 'gform_pre_render', 'gform_prepopluate_post_type' );
add_filter( 'gform_admin_pre_render', 'gform_prepopluate_post_type' );

function gform_prepopluate_post_type( $form ){
	$post_type	= 'project';
	$order_by	= 'title';
	$order		= 'ASC';
	$return		= 'title'; // What you want the value to be, title or id
	$form_id	= 2;
	$field_id	= 2;

	// Only populate the relevant form
	if( $form['id'] != $form_id ) {
		return $form;
	}

	// Initial blank value (remove the below line if don't want)
	$items[] = [ 'text' => '', 'value' => '' ];

	// Fetch the relevant posts
	$posts = get_posts([
		'post_type' 		=> $post_type,
		'order_by'		=> $order_by,
		'order'			=> $order,
		'posts_per_page' 	=> '-1'
	]);

	// If there's post, loop through and add them to our array
	if( $posts ) {
		foreach( $posts as $post ) {
			$title = apply_filters( 'the_title', $post->post_title );
			$value = ( 'title' == $return ) ? $title : $post->ID;

			$items[] = [ 'value' => $value, 'text' => $title ];
		}
	}

	// Loop through the fields. For the one that matches update the choices to our $items
	if( $form['fields'] ) {
		foreach( $form['fields'] as $field ) {
			if( $field_id == $field['id'] ) {
				$field['choices'] = $items;
			}
		}
	}

	return $form;
}