This example will flag the submission of a form as honeypot spam

add_filter( 'frm_process_honeypot', 'my_custom_function', 10, 2 );

function my_custom_function( $is_honeypot_spam, $atts ) {

	if ( $atts['form']->id === '5' ) { //change 5 to the ID of your form

		if ( $is_honeypot_spam ) {

			// handle honeypot spam.

		}

	}
	return $is_honeypot_spam;

}