I have Pokemon that were put into play during the turn I use Medicham V's "Yoga Loop" attack. I immediately get another turn from "Yoga Loop". Can I evolve those Pokemon during that new turn?
Yes, absolutely! If you take another turn after using Yoga Loop you have to do everything you would normally do as part of your turn, including evolving any Pokemon that were in play on the previous turn.
Source: TPCi Rules Team (2024-01-04)

Relevant cards

Note: All applicable cards may not be listed below.
SWSH7_83
SWSH7_83