Only way to get that crystal was walljumping with the hamster. Kinda tricky, specially since I didn't know the haster had a walljump. Just had to hold against the wall and keep jumping...
His name is Rick. This shard was a callback to his appearance in Kirby's Dream Land 3, where he could walljump (and also had a very difficult stage where you had to escort him to the end of a heavy platforming stage in order to get a heart star). All of the animals made by Rock/Cutter were from KDL3, with Rick, Kine and Coo also originating in KDL2.