If you seal the frog you’re reducing its ability to collapse, which will negatively affect your hook-ups.
If you go with a Snag proof frog they have a hook channel built into the frog so you don’t have water filling a hollow body. I believe its only in the Ish’s Phat Frog series.
I’ve never had a SP fill full of water period. Scum frogs? Oh yeah, but I chalked that up to them being crummy baits. If those cheap things off the shelves of Walmart don’t fill full of water then there is ZERO tolerance for that behavior from more expensive baits IMHO.
I’ve heard some bad things about the KVD frogs and BPS frogs sinking. I don’t know why it’s so hard to design a TOPWATER frog bait that floats.
Basically, what are the hollow body frogs out there that aren’t sinking trash?
I know of 2 I have fished: Spro and Snag Proof