WikiRhymer has about 2,000 rhyming words and phrases for "frog" starting with...

bog
    clog
      flog
        fog
          hog
            jog
              slog
                smog
                  nog
                    agog
                      pirog
                        prolog
                          Fogg
                            Haag
                              Hogg
                                Maag
                                  Ogg
                                    Prague
                                      Waag
                                        • eat high on the hog
                                        • go the whole hog
                                        • go whole hog
                                        • high off the hog
                                        • off the hog
                                        • on the hog
                                        • road hog
                                        • whole hog
                                        Pure Rhyme Set #1 of 1 (Add to/Edit Set Members)
                                        Words that have a pure rhyme on their last syllable only.
                                        prologue
                                          gulag
                                            backlog
                                              eggnog
                                                groundhog
                                                  hedgehog
                                                    waterlog
                                                      demagogue
                                                        Herzog
                                                          Hertzog
                                                            Tagalog
                                                              End Rhyme Set #1 of 1 * (Add to/Edit Set Members)
                                                              Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely. (Click for more info)
                                                              Bronx
                                                                Tonks
                                                                  Near Rhyme Set #1 of 101 (Add to/Edit Set Members)
                                                                  twang
                                                                    Hwang
                                                                      Kang
                                                                        Kwang
                                                                          Tang
                                                                            Zhang
                                                                              Near Rhyme Set #2 of 101 (Add to/Edit Set Members)
                                                                              bonk
                                                                                bronc
                                                                                  bronk
                                                                                    conch
                                                                                      conk
                                                                                        honk
                                                                                          wank
                                                                                            Cronk
                                                                                              Near Rhyme Set #3 of 101 (Add to/Edit Set Members)

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                                                                                              Rhymes made up of more than one word. For instance, "jealous" and "tell us" or "shaky" and "make me."

                                                                                              No mosaic rhymes for one-syllable words.