Grappling as a player should include the standard rules for grappling.

In addition, something that would should be part of the SRD I believe is grappling while shape shifted.

For example, a druid who shape shifts into a bear can grapple (pin an opponent) as a bear and not just do the standard bite plus claw attacks.

Grappling can be found in the compendium under Making an Attack as grappling is considered an attack. Link can be found here:

https://www.dndbeyond.com/compendium/rules/basic-rules/combat/making-an-attack

As for the shaped-shifted druid, he should be able to perform any action a normal character can unless otherwise stated.

I totally see it now! Thanks - under Melee. I guess I didn't browse search correctly.

Thanks Hellsinginst