Here's what rhymes with tongu.
                        
                        
                    
                                new  knew  anew  mu  nu  moo  gnu  to  who  you  do  two  too  due  du  u  coup  qu  shoe  zu  canoe  dew  lieu  shew  su  sue  tu  undue  vous  chew  deux  fu  lu  rue  undo  zoo  adieu  ado  bu  hu  ju  jus  ku  loo  peu  pu  seu  shu  sou  vu  woo  yew  yu  boo  chou  chu  coo  cou  doo  ewe  feu  gu  mieux  ru  shou  thu  tue  vou  wou  wu  goo  mew  pooh  poo  shoo  roux  thew  whew  into  through  few  true  view  blue  drew  grew  que  crew  pursue  threw  blew  flew  q  avenue  bamboo  clue  cue  glue  hue  queue  renew  accrue  cu  ensue  flue  retinue  slew  stew  taboo  untrue  brew  flu  jusqu  pew  piu  tattoo  thru  beaucoup  fue  hew  shrew  tzu  vnto  vue  clew  halloo  valuer  kazoo  slue  phew  booboo  achoo  revenue  screw  debut  subdue  skew  eschew  kangaroo  outdo  shampoo  sinew  sprue  askew  imbue  outgrew  redo  strew  ballyhoo  honeydew  spew  bugaboo  endue  zebu  indue  peekaboo  buckaroo  muumuu  wazoo  regrew  atishoo  review  residue  rendezvous  construe  overdue  revue  overdo  cockatoo  fondue  foreknew  marabou  bestrew  overshoe  prevue  interview  hitherto  overview  withdrew  caribou  overthrew  barbecue  hullabaloo  barbeque  overflew  superglue  overdrew  overgrew  misconstrue