Yes, almond butter makes sense-- anything sticky the dog likes :)
I think that is usually the way a dog gets peanut butter (or almond butter) out of a kong: stick the whole tongue in, stretching as far as possible. Some dogs will keep at it for a long time, while others will give up fairly...
I would make sure he has a few suitable toys to chew on, and maybe consider putting a little smear of something tasty (like peanut butter) on one toy or another to make it extra-interesting. (For peanut butter or anything similar, of course you should not give him large quantities of it, because...
Are you looking for activities because the dog is bored, or because you are bored?
If you are the one who wants to do things, you might consider something like gently brushing him. That is sometimes relaxing for the dog, so not the best if he is full of energy and needs to get worn out, but...
Or make him search for his normal meals, by hiding the usual amount of food in several places. Dry kibble can be hidden all over the place, while wet food should probably be in dishes (but it could be in several small dishes, in different places each day.)
"Hiding" might be as simple as putting...