<p>have snuck or have sneaked?</p>
<p>Both sneaked and snuck are the simple past and past perfect forms of sneak. “Sneaked” is the traditional form. “Snuck” sneaked into American usage and is now standard. The same is the case for dive, dove, and dived. “Dived” is the traditional form, but “dove” is the common variant in speech but less so in formal writing. You never could’ve gone wrong with the traditional form, and you also can’t go wrong with the now-standard form since language changes constantly and things that are popular and grammatical are basically acceptable.</p>
<p>By the way it’s not past particle. The correct term is past participle.</p>