The books I used for Tengu's DOA2U, DOA4, and DOAD frame data, respectively were:
Dead or Alive Ultimate Best Shot
Dead or Alive 4 Official Guide Master File
Dead or Alive: Dimensions Guide Book
Dead or Alive Ultimate Best Shot
Dead or Alive 4 Official Guide Master File
Dead or Alive: Dimensions Guide Book
The way I acquired that frame data was through various DOA books that were exclusively released in Japan, that I imported for the sake of collecting. Fortunately, they each had complete frame data for all the characters of whichever respective game each book was for.
I took it upon myself to use that info to provide Tengu's frame data to the FSD wiki.