They're going to have some issues bringing frogs in as a party to a lawsuit (those little green bastards can't even sign the appropriate paperwork... lack of opposable thumbs) but there's nothing legally noteworthy about a non-profit group obtaining standing to sue the government about an environmental or ecological issue that is covered under statute, or under the executive branch/EPA's enforcement jurisdiction.

>that is covered under statute,

And this Texas law gives statutory standing.