First up a location would help a lot. What to do and when will depend on whether you are in northern hemisphere or southern and at what latitude or growing zone.
These appear to be Japanese maples. There is another North American maple species called Red maple but quite different to these.
JM respond well to chopping the trunk. New shoots will sprout from those dormant buds on the trunk and grow into new branches after you chop these down lower. Even if you chop so there's no leaves left they should sprout from those buds.
Getting them into larger pots will help keep them alive over summer and allow them to grow a bit faster than in little pots.
Propagate means to grow more plants from these ones. Some people can get JM cuttings to strike new roots but many people struggle. Searching this forum should find a few threads with advice on how to do JM cuttings. I get far better results with seed than with cuttings but that obviously requires access to seed.
Atropurpurea and Bloodgood are both specific cultivars of Japanese maple but there are many other cultivars with reddish leaves so these may or may not be either of the cultivars mentioned. They may also be seedlings from a red leaf JM in which case they are completely new cultivars or simply Japanese maples.