You certainly can get tora-fugu in the USA, it arrives pre-cleaned and frozen, imported by Wako International, mostly to be served at Restaurant Nippon in NYC, but also available in a few other restaurants.
There are also varieties of puffer fish caught in US coastal waters, the FDA has this to say about domestic puffer fish:
Puffer fish caught from the mid-Atlantic coastal waters of the United
States do not contain these deadly toxins and are considered safe to
eat. They are less expensive than imported puffer fish and may be found
in markets or restaurants. However, puffer fish caught off the east coast of Florida should not be eaten because the entire fish is potentially toxic.
Some puffer fish around Florida carry saxitoxin, structurally distinct from the more well-known tetrodotoxin.
