"Where words fail, swords prevail. Where blood is spilled, my cup is filled" -Cartaphilus
"I have found the answer to the meaning of life. You ask me what the answer is? You already know what the answer to life is. You fear it more than the strike of a viper, the ravages of disease, the ire of a lover. The answer is always death. But death is a gentle mistress with a sweet embrace, and you owe her a debt of restitution. Life is not a gift, it is a loan."
I was even thinking if OTHER party members could cast spells on the druid perhaps? I see Telepathy, but that's an 8th level spell!! Could be worth the casting...but very situational.
Helm of telepathy would work I guess...but limited range. I was thinking of scouting out something (as a bat perhaps) and be able to provide information to a party member for example (guide them to a hiding creature etc).
WotC seems to have shut down the thought-stream pretty tightly.
Hi, new here, but I've an 8th level tiefling druid; you could always work out in advance a certain number of signals using either animal vocalizations (a crow's caw, a wolf's bork) or limb/paw scrapes on the ground to signify different conditions, or even just a "yes/no" response so other party members can question you while in Wild Shape:
"Is the way safe?" CAW! "Are there foes ahead?" CAW CAW! "Orcs?" CAW! "Goblins?" CAW! "Kobolds?" CAW CAW! "How many?" CAW CAW CAW CAW CAW CAW!
...or beak taps or whatever. Can be kind of a fun mini-game to RP.
I mean, if you are playing a Kalashtar Druid, if the DM allows it you can use your racial trait Mind Link to communicate with one party member. If it's during battle you just use Mind Link Response as a bonus action to communicate with somebody within 60ft.
There are various ways you can go about it, but this here is just an example to use since as a druid you withhold your intelligence in Wild Shape.
Example...change into bat for stealthy searching an area. Would like to communicate direction to party. Possible?
Player's Handbook - p 178 "Other Intelligence Checks. The DM might call for an Intelligence check when you try to accomplish tasks like the following: Communicate with a creature without using words"
So, yes, in effect, play charades.
As for predetermined gestures: So, even assuming the animal form and body can physically make the necessary gestures (depends on the animal I suppose), others players might misinterpret - The same is true for drawing and writing, your animal form might not have the necessary physical dexterity. So making a check is probably appropriate.
As for DC, I wouldn't set it too high (unless the idea is very complex), starting between DC 5 and 10.