Trinjya will get ready to throw her dagger at the frog creature as soon as it either gets within 20 feet of her or sombody else attacks it or it starts to run shout or does something else that would alert the whole camp. 

(crossbow ready. awaiting firing order, sirs)

Trinjya, Sirq and Samael ready themselves...

 ((Approaching patrol is 35-45 ft from you all, and would be getting cover from the vegetation for anyone with an attack roll prepped. Morn, I think you're the only one with a save spell prepped, you'd be able to get LoS to trigger w/o cover AC bonus.))

Horatio has the Imp maneuver towards the next target, then readies an eldritch blast for when LOS on the incoming target frogman of the party!

(cover type for the frogman?)

Morn sees the frog approaching, but continues to hold his cantrip as he waits for the others to trigger their attacks.

((Since it seems like everyone is holding, I took the liberty of assuming that everyone was holding until Trinjya's conditions were met, of patrol within 20 or something else happens.))

Everyone continues to hold, as the patrol approaches, when it's 25 ft away from Trinjya, Horatio's associate becomes visible and jabs at it with his tail!

((Attack and damage for the imp, please Horatio!))

((The rest of you can make your attacks vs the patrol, it will have half cover from the vegetation.)) 

Morn sees the imp attack the frog and releases his frostbite on the frog creature (Con Save DC 13 or 6 cold damage and disadvantage on next weapon attack).

Attack: 15 Damage: 4

samael fires his crossbow

edit: hold on, technical difficulties

Attack: 21 Damage: 7

(srsly, it parses after i run a second set through?!)

Attack: 23 Damage: 5 + 13 poison, DC 11 con save

Via stinger, cold and bolt, the bullywug is quickly dropped.

(reloading. move up or wait for next target?)

Trinjya is about to fling her dagger at the creature when it collapses partialy frozen and pierced by bolt and stinger. She sheathes her dagger and sneaks up to the bushes next to the new corps. How much of the camp is visible from there?

Perception : 15

Morn nods to himself, happy with their progress so far. He moves further north, trying to find another bush to provide some cover while keeping watch for the next patrol (Perception: 12).

((This isn't the view of any one character, but you've generally been able to see about this much of the settlement.))

7 perception

(adding to the perception-fest)

((If her action is enough for that, Trinjya would draw the dead frog into the bushes and out of sight of the village if not, she will just wait and watch the camp for now. ))

(OOC - we've taken down 4 of the 6 patrolling guards now, correct?)