Might be hard to tell, but the first one is supposed to be some kinda variation of Duskull and Scyther fusion (311.123) inspired by Asclepius cover art, and the other two could be basically just any of Dugtrio and Stunfisk's fusions (for example: 51.100, 121.51, 327.51 for Dugtrio and 3.420, 364.420, 420.318 for Stunfisk). Sorry if I misunderstood the rules somehow.
Separate sprites in source
Vinebooru
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Separate sprites in source