Does look like A. parryi, but could be any number of Agaves at such a small size. Something is less than ideal if those tiny little things have been in ground for two years. OTOH, it is just odd that they should offset so prodigiously but not grow. Are they getting enough water?

Possibly Agave parryi

Wait it sounds like you have Genus and species already. Are you looking for a variety or subspecies? I would say Agave parryi looks like a good id:). It's definitely not A. parryi truncata or neomexicana as you've stated. That leaves you with A. parryi v. couesii, A. parryi subsp. parryi, and then a variety of A. parryi subsp. parryi which is A. parryi v. huachucensis. There's also this one called A. parryi 'Estrella'. I don't think it's A. parryi v. couesii. The leaves seem to be thinner on those. This is where it's hard to id though because the mother plant of your babies from what I can see looks like has been living a cush life. Like it gets water and not tons of sun. So you're not seeing the true structure of the plant. Plant that Agave in all day sun with little water it will look very different. That's why I think you're having a hard time at iding:). Along with myself;). I wouldn't commit to any varieties or subspecies quite yet. Growing conditions can totally change the look of your babies. I would acclimate to all day sun and give little water than it will be easier to tell. I think:). If you have the space put them in ground. I would just stick to Agave parryi for now. Like I've said you've got a Genus and a species that's good. Don't get hung up on other names. Just keep it simple for now.

This is the only Agave that I get a reaction from when poked. I get a rash even if brushed by the leaves when walking by. Someone told me the spikes along the leaves have sodium hydroxide crystals in them that are causing my reaction. I don't know if that is true. My neighbor planted 3 in an island in his front yard. Now he regrets it. This one is about 1.5 to 2 feet tall and pupping on runners. Now it is about 4 feet tall. He's getting pups in the yard, too. I still think it is a pretty plant. It just needs too much maintenance that I can't give it. Although . . . I never considered keeping it in a pot. Oh - and our green waste won't take these unless you cut all the fronds off and bundle them. They don't want to be poked by them, but they took my Agave desmettiana (after it bloomed) with no questions asked.