What actors and actresses appeared in Dugong makamandag - 1930?

It seems you're asking about a film called "Dugong makamandag". While it's possible that a film with this name exists, it's not widely known or documented. It's very unlikely that information about the cast would be readily available.

Here's why this could be the case:

* Missing or Incomplete Records: Older films, especially from the 1930s, might have incomplete or missing records.

* Regional Film: This film might have been a local production with limited distribution, making it harder to find information about it.

* Misinformation: The title might be incorrect, or there might be a misunderstanding about the film's existence.

To find more information, you might try:

* Searching in Filipino film archives: Look for online databases or websites related to Filipino cinema history.

* Contacting film historians: Reach out to experts on Philippine film history or organizations focused on preserving Filipino cinema.

* Checking local libraries: Check the film or media sections of libraries in the Philippines, particularly those with collections of local films.

Keep in mind that even with these efforts, finding information about a potentially obscure film can be challenging.