Forum:Q. Lord of D. and KIng Dragun effect vs penguin soldier

Let say I have Lord of D., Blue eyes white dragon, and red eyes black dragon on the field and my opponent have penguin soldier. I attack with Blues eyes with dragon, my opponent flip effect activate and send back to my hand blue eyes and red eyes.

Now let say I have king dragun, blue eyes with dragon, and red eyes black dragon and my opponent again have penguin soldier. I attack with King dragun and my opponent flip activate and send back to my hand blue eyes and king dragun

Can my opponent do that when Lord D or King dragun says dragon type monster cannot be target for the effect of spell trap or monster effect.