Whatever they are, they are growing well! The former largest one is slowing down and seems to be more stocky in build with its leaves unfolding just after the previous ones. The 'twin' plants have overtaken the other one in height and are churning out new leaves at a rate of 1 leave per 5-6 days. They are also a healthier green and have a more grass-like upward growth.
upload img to html link