Eventually (~hour or 2) of exploring any modpack that contains Quark (like ATM3L) the lag becomes outrageous, '/forge entity list' will show ~5k-10k quark:frog 's, need to /kill @e[type=quark:frog] then /kill @e[type=minecraft:item] to clear the lag - considering they spawn like CRAZY (like vanilla mobs on cursed earth) as opposed to rarely in small numbers and respecting a cap

ATM3L being what I'm playing right now uses version r1.6-176. I have no idea what version is current, it doesn't say on the front page here on git, nor on the front page of quark.vazkii.net

also, not a real issue, just curiosity, but the dang frog things are as ugly as sin itself, everything else in the pack is so nice, and display well the effort and passion put into it, why are these frogs so lackluster and terrible looking?

This has been fixed already.