Type of milk
What it looked like once it had frozen ?
Time taken to freeze
I think it is not going to freeze because when it gets chilled it makes the condensed milk sticky.
I think that the soy milk is going to be frozen in the middle but the outside is not yet frozen.
Almond milk will freeze quickly because it has lots of water in it.
Conclusion- The condensed milk did not freeze because there was no water so thats why it did not freeze. But the other milks froze because it had water in it.