Just got the new issue of Nat Geo, and I was happy to find that
Raúl Martín has a nice two page spread in
the feature on ancient crocodiles. It depicts the giant cretaceous crocodile
Deinosuchus lunging for the tyrannosaur
Albertosaurus. The image was not made available online, but Martín has covered similar territory for the magazine before. Here is a piece he did several years ago; this time setting is Africa and the players are the giant croc
Sarcosuchus and the spinosaurid
Suchomimus. Though I must say that this illustration definitely distorts the scales of the two by placing
Suchomimus so far in the background - the new one places
Albertosaurus the same distance from the viewer as
Deinosuchus.

The crocodile article is, in true Nat Geo style, a tie-in to an upcoming special on their cable channel. Here's a preview.
Just because I'm feeling frisky, here's another take on
Suchomimus v.
Sarcosuchus by the always entertaining Luis Rey.

There probably isn't any better way to depict a giant crocodile than by letting it prey on a giant, snaggle-toothed theropod.