You are, of course, correct in the first cases, but wrong in the second part.

Pled is past tense, and pleaded is the intransitive. Where there is an object, pleaded is grammatically incorrect. Oddly, concise dictionaries seem to ignore this, while the unabridged versions do not.

(I haven't actually checked "snuck" vs. "sneaked", but I will say "snuck up" with or without an object. :-))