Danny's Doodles: The Jelly Bean Experiment & The Squirting Donuts by David A. Adler (2 in 1, Very good, 2018, Pbk, 216 pages,Jabberwockykids)

This two in one book features:

The Jelly Bean Experiment #1: Here's a fact: My new friend Calvin Waffle is 100% Weird

Danny Cohen and Calvin Waffle are two very different kids. Danny likes playing baseball; Calvin enjoys strange experiments. Danny follows the rules at school; Calvin tries to drive his teacher crazy. Danny and Calvin decide to team up for the big jelly bean experiment. Will it lead to trouble? Maybe. Will they have fun trying? You can count on it.

The Squirting Donuts #2: Here are two mean and nasty words: Mrs. Cakel

Something has gone wrong in Danny and Calvin's fourth-grade classroom―out of the blue, Mrs. Cakel has transformed from a rampant rule-enforcer to a quiet excuse-accepter. Has she been replaced with an alien? Has she undergone a top-secret personality makeover? Danny and Calvin decide there's only one way to find out what's really going on―spy. But spying soon leads to a greater mystery filled with dog chasing, jelly-injected donuts, prune butter-included experiments, riddle mania, and more!