Cut each shrimp into quarters. (The shrimp is going on the bread rounds and you want to get some in every bite, not try to bit through 1 shrimp.) Place the shrimp in a small mixing bowl.
To the shrimp, add the lime juice, cilantro, cumin, oregano, salt, and pepper. Stir to combine. (Don't worry if there's extra lime juice in the bowl.)
Cut the baguette into 1/4-inch thick slices. You can use to bread as is, or brush each slice with olive oil and bake at 350 degrees F until crispy and golden.
Spread 1-2 tablespoons guacamole on top of each bread slice. You can use more of less to taste, but you want a good layer of guac.
Spoon about 1 tablespoon of the shrimp on top of each bread slice.
Serve immediately.
Notes
If you'd like to get some more flavor into your shrimp, you can buy raw shrimp and cooked it with butter and garlic until it's pink all the way through. Let the shrimp cool until it's safe to handle and use as directed.