1 syllable:
-logue, blog, blogg, bog, clague, clog, cog, craag, dague, dog, dogge, drcog, flog, fog, fogg, frog, frogg, frogge, glogg, graag, grog, grogg, haag, haug, hog, hogg, hogge, jog, krog, lague, log, logge, maag, mogg, og, ogg, pdogg, pflp sog, phlog, plog, pog, pogge, prague, progg, rog, rogge, scrog, skog, skrog, slog, smaug, smog, splog, sprog, strog, tague, waag, zaugg, zogg

2 syllables:
-agog, -agogue, acog, agog, agogue, applog, augcog, backlog, bairaag, balrog, bandog, barog, bayog, beamdog, befog, bigdog, bihag, bird-dog, bird dog, bonedog, brewdog, buldog, bull-frog, bulldog, bulldogge, bullfrog, bulog, camfrog, cant dog, catdog, cheeselog, cholagogue, coachdog, coach dog, condog, coondog, corndog, cosag, coydog, croagh, dazhbog, defog, delag, den haag, dildog, dos/4g, eclogue, egg-nog, eggnog, embog, eqlog, facog, fire-dog, fogdog, footslog, freakdog, fseog, funlog, gaplog, grass frog, graylog, great dog, green frog, groundhog, guard dog, guide dog, gulag, gundog, gun dog, hamdog, hang-dog, hangdog, hedgehog, hertzog, hilog, hop-frog, horndog, hot-dog, hotdog, hound dog, housedog, ibague, icefrog, lapdog, leap-frog, lifelog, liveblog, lm-prolog, locog, log-log, longdog, madrague, magog, medlog, milblog, moblog, moondog, morag, musk hog, nate dogg, nidhogg, nig-nog, objlog, parag, parlog, peat bog, photog, pi-dog, pirog, poplog, portague, precog, prelog, prolog, pug-dog, putlog, pye-dog, pyedog, qu-prolog, quahaug, quahog, quohog, ratdog, recog, roadhog, road hog, rsyslog, sandhog, sawlog, sb-prolog, schelog, screw log, seadog, seahog, sea dog, sheepdog, sheep dog, sheep frog, sherdog, shockdog, shot-clog, silog, sledge dog, sled dog, socog, spacehog, spring frog, spurdog, starlog, sundog, svarog, swisslog, sys-frog, syslog, tablog, taclog, tailed frog, templog, tetaug, toadfrog, tofog, top dog, toy dog, tree-frog, treefrog, tree frog, true frog, unclog, vandaag, warblog, watchdog, weblog, whole-hog, wild dog, wolf-dog, wolfdog, wolog, wood-frog, woodfrog, yon-rogg, yule log, zilog, zytglogge

3 syllables:
analog, analogue, angus og, anti-fog, antifog, antilog, antismog, anurag, armikrog, astrologue, attack dog, badger dog, ballarag, bandar-log, barking frog, beetsterzwaag, belobog, bibliog, calbayog, calinog, caradog, carriage dog, cascades frog, cat-and-dog, catalogue, changelog, chemofog, chernabog, chilidog, chili dog, chorus frog, copenhague, cricket frog, cs-prolog, datadog, dcslog, decalogue, dekalog, demagog, demagogue, devil dog, devprayag, dialogue, dipolog, dog-eat-dog, duologue, ecrc-prolog, epilog, epilogue, ethnologue, euchologue, firedog, flyingdog, french bulldog, glottolog, golliwogg, grammalogue, haemagogue, harpoon log, hearing dog, hemagogue, herring hog, hirulog, holagogue, homologue, horny frog, hunting dog, hydragogue, hypnagogue, ic-prolog, insarag, isologue, kenalog, lactagogue, leopard frog, lexicog, lithagogue, little dog, lymphagogue, magalogue, maltese dog, melologue, menagogue, menulog, metagogue, microblog, microlog, monkey dog, monolog, monologue, mummachog, mummichog, mystagogue, ninkharsag, nu-prolog, objvprolog, oceanog, ortholog, overdog, patent log, pedagog, pedagogue, pettifog, philologue, phlegmagogue, photoblog, physagogue, pie-dog, pnu-prolog, police dog, poodle dog, porthmadog, prairie-dog, prairie dog, psychagogue, psychologue, ptysmagogue, raccoon dog, robber frog, sausage dog, semilog, shepherd dog, sialagogue, sinologue, sinulog, skittle-dog, sporting dog, steven ogg, steyr aug, superdawg, swi-prolog, synagog, synagoge, synagogue, tagalog, theolog, travel-log, travelog, travelogue, tremadog, trialogue, typedprolog, underdog, verilog, waterdog, waterlog, water dog, working dog, yellow-dog, yorkshire fog

4 syllables:
abominog, belgian sheep dog, brycheiniog, cape hunting dog, cardiologue, card catalogue, course catalogue, delta-prolog, domestic dog, electrosmog, emenagogue, emmenagogue, english bulldog, eskimo dog, galactagogue, gen.g, goliath frog, hair of the dog, helminthagogue, hyena dog, idealogue, jacob rees-mogg, magyarorszag, melanagogue, memphremagog, myriologue, pariah dog, parts catalogue, pepe the frog, pickerel frog, ptyalagogue, q-analog, razorback hog, rudraprayag, secretagogue, seed catalogue, shetland sheep dog, videoblog

5 syllables:
admiralbulldog, african clawed frog, andorra-prolog, chrysanthemum dog, eastern cricket frog, german police dog, german shepherd dog, isotopologue, modula-prolog, monopolylogue, multi-binprolog, northern cricket frog, sonic the hedgehog, systemverilog, topdog/underdog, whitetail prairie dog

6 syllables:
african hunting dog, antisialagogue, chameleon tree frog, japanese raccoon dog, tarahumara frog, tears in rain monologue, the princess and the frog

7 syllables:
courage the cowardly dog, south american bullfrog