To the bowl of a large food processor fitted with the blade attachment, add the shrimp, egg, & salt. Pulse until the mixture's smooth.
Add in the green onions, and pulse again- just until they're also blended in.
Divide the shrimp evenly out among all the bread triangles. Carefully spread/smooth it out over one face of each triangle.
Fill a large pot with oil, one inch deep. Heat it over medium high heat.
While the oil's heating, dip the shrimp mouse covered side of each bread triangle into bread crumbs. Press it in if needed, to ensure that they're coated evenly.
Transfer the coated pieces of shrimp to the hot oil. Working in batches of four, add them to the hot oil shrimp side first. When it's golden brown, flip it and cook until that side's also golden brown & crispy.
Transfer to a paper towel lined plate to drain. Serve immediately after with dipping sauce of choice, and a garnish of fresh thinly sliced green onions.