This is a rare and missable creature/object. Be sure to scan it the moment Samus sees it.
Ice Burrowers live in the Phendrana Drifts region on Tallon IV in Metroid Prime. Ice Burrowers are similar to their "cousins", but have slightly adapted their bodies to compensate for their freezing surroundings. They still retain the ability to launch acid as they emerge from the ground, so it is advisable to locate and eliminate them by looking for a moving lump in the snow.
"The Ice Burrower is a hardy life form that has adapted to the frigid climate of Phendrana. It spends most of its time tunneling through the frozen soil, but occasionally surfaces to attack passers-by."