drop table smp_tmp;
create table smp_tmp(dat date);
insert into smp_tmp
select add_months(trunc(sysdate,'year'),level-1)from dual connect by level <13;
commit;

declare 
  type am_type is table of varchar2(200) index by varchar2(100);
  v_am am_type ;
begin
v_am('01.01.2017'):='''01.01.2017'' as January';
v_am('01.02.2017'):='''01.02.2017'' as February';
v_am('01.03.2017'):='''01.03.2017'' as March';
v_am('01.04.2017'):='''01.04.2017'' as April';
v_am('01.05.2017'):='''01.05.2017'' as May';
v_am('01.06.2017'):='''01.06.2017'' as June';
v_am('01.07.2017'):='''01.07.2017'' as July';
v_am('01.08.2017'):='''01.08.2017'' as August';
v_am('01.09.2017'):='''01.09.2017'' as September';
v_am('01.10.2017'):='''01.10.2017'' as October';
v_am('01.11.2017'):='''01.11.2017'' as November';
v_am('01.12.2017'):='''01.12.2017'' as December';

for i in 
        ( 
          with tab as (select to_char(d.dat,'dd.mm.yyyy') ff , d.dat dat from smp_tmp d)
          select t.dat,t.ff,
                 --v_am(t.ff)res --not work
                 --v_am( to_char(trunc(sysdate,'month'),'dd.mm.yyyy')) work_
          from tab t
        ) 
        loop
dbms_output.put_line(i.ff);
dbms_output.put_line(v_am(i.ff)); --work

end loop;          

end;