The common name is "Norfolk Island Pine" that could be a source of confusion. They are most commonly found in the US in supermarkets during the holidays as for most, it's an indoor Christmas tree. In warm climates like Florida they can be grown outdoors and can get quite huge. And by huge I mean picture a 200' pipe cleaner.

Never mind. Monk Fruit have seeds more like a bitter melon. This looks like some sort of small honeydew to me.

I see you're new here, welcome. Pls. do some reading around here on mixes. While it's good that you're already using Cactus & Succulent mix (C&S for short), you will quickly see that many if not most of us here have learned to amend our C&S mixes (w/perlite or pumice, at least 30% or 50% to be safest), 'cause these days, commercial mixes have too much peat in them (kills out plants) &/or include wetting agents to retain water (also kills our plants). Others of us on here use mixes you'll see mentioned as Gritty Mix or variations of 5:1:1, things like that, which over time folks have learned worked well for them. Also some of these pre-made mixes contain fertilizer as well, which many of us wish to control ourselves rather than someone unfamiliar w/ our growing conditions. There are lots of opinions on mixes, but key & accepted by all of us is that to grow C&S, we need fast draining mix & what you've pictured above doesn't look like that. So that's an improvement that could be made easily & help the plants more that almost anything else one could try.

They are called sea beans. Here is a link to a google search for sea beans - take a look, decide which one you have, then do another search for it's botanical name by typing in whatever id you get into google.com. Here is a link that might be useful: Sea bean images