We don't have synonyms for seussian yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are session, susian and hessian.
(adj) :
Of or relating to Dr. Seuss (Theodor Seuss Geisel, 1904–1991), American writer and cartoonist best known for his imaginative children's books, often written in rhyme.
(adj) :
Of or relating to Dr. Seuss (Theodor Seuss Geisel, 1904–1991), American writer and cartoonist best known for his imaginative children's books, often written in rhyme.