Q1
One of the 5 ways to enter Warshaper is
"Polymorph as a spell-like ability (astral deva, planetar, solar, couatl, marilith, bronze dragon, gold dragon, silver dragon, efreeti, leonal guardinal, night hag, ogre mage, pixie)."

Most of these creatures don't have polymorph as a spell like ability. The monsters with change shape are covered elsewhere but how do the dragons (who have alternate form) and leonal (which doesn't seem to have any kind of shapeshifting) qualify for warshaper?