What do you think??

[Kurt]

Frogs in Massachusetts, for the most part, are fine. However, the northern leopard frog, Lithobates pipiens is in decline over most of it's range, which does include the Bay State. Also, the Commonwealth of Massachusetts considers the eastern spadefoot toad, Scaphiopus holbrookii to be a threatened species. It is the only native species we are not aloud to keep.
State law also states that we are only aloud to keep up to two specimens of per native species that are legal to keep. So I can keep two gray treefrogs, but no more.
Commercial collecting of an amphibians is strictly illegal here, and you can't buy or sell any native species. So if I wanted to get rid of my eastern milk snake, I would have to give it away and not sell it. Of course this doesn't stop some pet stores from selling native animals, as I have seen eastern painted turtles, gray treefrogs, spotted salamanders, and black rat snakes for sale. Black rats are considered endangered by MA and you can get in serious trouble for trying to sell them.
Elsewhere in the US things are worse, especially in California, where chytrid is wiping out the mountain yellow-legged frog, Rana muscosa.

[Tom Highum]

Yes it is common in the US not to be able to sell native wild life and to have restrictions on the amounts. In Colorado it is you can collect 4 of one species (select species) per year and can have a maximum of 12 total wild caught animals. Though this doesn't include snappers of tiger salamanders because they require fishing licenses to capture.
Some states have problems with invasive bullfrogs eating native frogs.

[Kurt]

Arizona and California come to mind.