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You can Special Summon “Dark Jeroid” with “Ambulanceroid’s” effect because it has “roid” in its card name.
(1) When a roid monster is added from your GY to your hand, you can Special Summon that monster.
The (1) optional Trigger Effect activates & resolves on the field.
You can Special Summon "Dark Jeroid" with the effect of "Ambulanceroid" because it has 'roid' in its card name.
If you add 2 'roid' monsters to your hand with the effect of "Expressroid" while you control "Ambulanceroid", you can activate its effect to Special Summon both 'roid' monsters.