What are the frequency ranges of most marine mammal vocalizations?
Here there are spectrograms from Bottlenose dolphins (Tursiops truncatus), Killer whales (Orcinus orca) and False killer whales (Pseudorca crassidens).

Here there are spectrograms for Humpback whale (Megaptera novaeangliae) and from Sperm whales (Physeter catodon or Physeter marcocephalus)

Here there are spectrograms from Blue whale, Fin whale and Minke whale.

Some other google search for "spectrogram + your preferred cetaceans" should make your list. Enjoy.