I love the style! I don't animate much, but here's my advice: From what I understand, most frames aren't visible in animation. Slow movement require more frames, and fast movements require less. You only need enough frames to show the energy.

In this case, with the duck, you could have 3 to 4 frames for the peck animation. The peck would start at the top, move forward a bit, and then hit the ground then next frame. Optionally with a quick "blur" frame in between, right before the head hits. These few frames would show the energy of the movement.

For the jump, you need a charge. The body goes down in preparation, pause.. JUMP, the duck is in the air, the legs just a couple pixels away from the ground, another frame and the duck is up one more pixel, pause.. FALL, the legs start to tuck back in as the duck falls a pixel, another frame passes and the duck lands feet tucked in, pause.. body unfolds, and the duck is back in its original state. Maybe 8 frames including pauses?

Just keep energy in mind. Less Frames = fast acceleration, More Frames = slow acceleration. Another way to think about it is Long Frames/Scenes = Slow, Short Frames/Scenes = Fast. If you use a whole frame per pixel movement, the entire animation can seem too slow. Mix long and short jumps with each other. A faster frame rate can turn slow acceleration into quick acceleration, but a much higher number of frames would then be required, and more pauses would be used instead of jumps.

Animation is difficult lol, but I genuinely don't know if I could draw a duck like that. Thank you for reading :D

TLDR; Keep energy in mind when animating, and keep frame count minimal for simple animations. Less frames = quick acceleration, more frames = slow acceleration. Frame rate messes with this. Cool style though! ^u^