When seeds first germinate they send up 'seed leaves' aka cotyledons. Cotyledons are kind of like the yolk of an egg .. it feeds the seedling and begins photosynthesis before the true leaves start to appear and in some cases can be rather thick. Usually the cotyledons don't look anything like the true leaves and will eventually fall off once true leaves start appearing.
The first picture might be the Cherry. The potting mix looks way too wet and are those round yellow things time release fertilizer? If it is, remove them and don't be feeding until at least 4 sets of true leaves are showing up. The 2nd picture looks like lemon. Both are wanting warmth and sun ... considering your zone they both have sorta gone dormant. Get the soil temperature in the upper 60's to low 70's to wake them up and as much direct sun as possible - also let the soil dry out a bit.
